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In this article we'll go through some of the details describing the three different types of TMG clients, and then we'll begin a walkthrough of the server-side configuration that influences Web Proxy client behavior. Like its predecessor, ISA Server, the TMG firewall supports three types of clients:� SecureNAT client� Firewall client (TMG client)� Web Proxy clientUnderstanding the client typesThe SecureNAT client is a computer that is configured with a default gateway that enables it to reach an Internet gateway.

The default gateway might be the IP address of the internal interface of the TMG firewall, or it might be the address of a router that is configured with a routing table entry that enables connections destined for the Internet to be routed through the TMG firewall. The key issue with the SecureNAT client is that it is dependent on the routing infrastructure of your current network tmg web proxy not working that all Internet bound connections are forwarded through the TMG firewall.

The SecureNAT client supports all protocols that are included with the TMG firewall, and it worming complex protocols that have Application Filters included with the TMG firewall. The SecureNAT client doesn�t require any additional software installation � you just set the default gateway on the client.The Firewall client (which is now called the TMG client, but was named the Firewall client for so many years that many of us are still in the habit of calling it the Firewall client, so I�ll continue to refer to it as such here) is a Winsock Proxy client (and in fact, this is what it was called prior to ISA 2000).

When a machine is configured as a Firewall client, all calls by Winsock applications on the Firewall client computer are forwarded by the Firewall client software to the TMG workijg. The TMG firewall performs name resolution on behalf of the Firewall client and then forwards the connection to the Internet destination.

The nice thing about the Firewall client is that it only needs a route to the TMG firewall; thus your routing infrastructure doesn�t have to be set up so that all Internet bound requests ttmg passed through the TMG tmmg when you�re using the Firewall client. The Firewall client supports all protocols, including eorking protocols that you can create yourself, and it supports all complex protocols, even if there is no Application Filter for the protocol. You have to install the Firewall client software on the Firewall client computer to make it a Firewall client.The Web proxy client is the one we�re going to be discussing in this article.

The Web proxy client enables the Web Proxy client computer to access the HTTP, HTTPS and HTTP-tunneled FTP connections to the Internet, so the Web proxy client supports a very limited number of protocols when compared to the SecureNAT nit Firewall clients. The good news is that you don�t have to install any software on the Web Proxy client computer.

A computer becomes a Web Proxy client when you configure the browser on the machine to use a Web proxy server. When the browser (or web enabled application) sends an HTTP or HTTPS request to the Internet, the Web Proxy client configuration will woring the connection and forward it to the Web proxy listener on the TMG firewall. The TMG firewall will resolve the name of the destination server on behalf of the client and then forward the request to the destination Web site or Web service.While at first glance it might seem that Web proxy client configuration is pretty simple, there are a number of potential complexities that you should become familiar with.

Perhaps �complexity� is the wrong term, because the Nt Proxy client configuration options aren�t necessarily complex or hard to understand, but hmg are quite a number of options that allow you a lot of flexibility, so you should be aware of these options in order to obtain the functionality that you need. We�ll look at those options in the following sections. Eeb Web Proxy Server Role on the TMG No TMG firewall is actually a collection of a number of network firewall roles. For those of you who are new to the TMG firewall, the TMG firewall can act as one or more of the following:� Network IDS/IPS (via the Network Inspection System and behavior IDS features)� Web anti-malware server� Web URL filtering server� Network firewall edge woring Network back-end firewall� Multi-homed DMZ firewall� Remote Prxoy VPN server� Site to Site VPN gateway� Windows DirectAccess server/gateway� Reverse Proxy Server� Forward Proxy Workinf quite a bevy pfoxy features and tmmg that are packed into the TMG firewall.

However, depending on the deployment model you choose for the TMG firewall, you may lose some of the functionality. For example, if you configure the TMG firewall to be a front-end, back-end, or DMZ firewall, you get the entire collection of features and functionality listed above.

However, if you deploy the TMG firewall as a single-NIC firewall, you lose most of the above listed functionality noot more.One thing you do get with all deployment models of the TMG firewall is the Web Proxy server feature.

Whether you have a multi-homed TMG firewall or a single-NIC TMG firewall, you will always be able to use the TMG firewall as a forward and reverse proxy server. Therefore, when it comes to Web Proxy worling configuration, the same principles apply to when the TMG firewall is configured as a workjng featured firewall, as when it is configured as just a single-NIC Web Proxy server.

Web Proxy Client Configuration on the TMG FirewallYou may have noticed that this is �Part One� in a series of articles. In this article, we�re going to use as an example�a TMG machine that is configured to be a front-end network firewall on a production network. We�ll start with the server-side configuration of the TMG firewall in this article and later on in this series, we�ll examine the client-side of the configuration.You can get started with the Web Proxy client configuration by opening the TMG firewall console and then clicking the Web Access Policy node in the left pane of the console, as shown in Figure 1 below.Figure 1After you click on deb Web Access Policy node in the left pane of the console, you then click the Tasks Tab in the Task Pane of the console.

In the Related Tasks section, click the Configure Web Proxy link, as shown in Figure 2.Figure 2This brings up the Internal Properties dialog box. This is actually the Properties dialog box you would see when you right click on the Internal network and click Properties, if you were in the Networking node in the left pane of the TMG firewall console.

It�s important to note that while you will need to configure the Web Proxy settings on the default Internal Network in almost all cases, if you have other internal networks that you�ve configured, you�ll want to configure the Web Proxy client configuration for those networks as well.

The General TabThe first tab you�ll see is the General tab. There�s not much to do here. You�ll see the Name of the network, and then a Description (optional) dialog box, as you can see in Figure 3. If you want, you can enter more detailed information about the network here. While there�s not much point to adding anything here for the default Internal Network, I often find it useful to include more information in this text box when I create a DMZ or other internal Networks, so that other admins of the TMG firewall can more easily understand the purpose of the Network.Figure 3Now click on the Addresses tab.

On this tab, you define the network by listing all the addresses that are allowed to connect to resources through the TMG firewall using the NIC that connects to this TMG network. If a computer has an address that is not included in this address list, then the connection attempt will be interpreted as spoofed and the connection attempt will be dropped.The best way to handle this option is to use the Add Adapter button, which you can see on the right in Figure 4� Home� Articles & Tutorials� Configuration - GeneralTen Common Mistakes Made by Forefront Threat Management Gateway (TMG) 2010 AdministratorsbyRichard Hicks[Published on 25 Sept.

2012 / Last Updated on 20 May 2013] IntroductionWith more than worjing decade of experience working with Forefront Threat Management Gateway (TMG) 2010 and its predecessors ISA Server 2006/2004/2000 and Proxy Server, I�ve noticed that many new (and even some veteran!) ISA and TMG administrators commonly make the same mistakes.

Some of these mistakes can be serious, often resulting in reduced security or performance. Some are violations of implementation or security best practices, while others could be categorized as simply an annoyance. Regardless, I am compelled to share them with you here in the hopes that you�ll avoid making some of these same mistakes.

Ten Common Nkt Network Configuration � By far, this is the single most common mistake TMG administrators make, worjing when two or more network adapters are installed on the firewall. When the TMG firewall contains only a single network interface, the configuration is simple and straightforward. The interface is assigned an IP address, subnet mask, default gateway, and DNS server(s) as required.

However, things change proxyy multiple network interfaces are configured. IP addresses and subnet masks are configured as usual. The default gateway can only be installed on one interface though, and it should only be configured on the External interface. Frequently I see TMG administrator�s mistakenly configuring default gateways fmg all network interfaces, which of course is incorrect. In a related note, DNS configuration is all too frequently misconfigured as well.

On TMG firewalls with multiple network interfaces, DNS servers should be configured only on the Internal network interface. These servers should be capable of resolving public hostnames. For more information on correct DNS configuration for Forefront TMG firewalls, click here. In addition, incorrect network interface binding order, incorrect or missing routing table entries, and TMG network definition are also common configuration errors.Creating Any/Any Access Rules � This one is one of my personal pet peeves.

I can�t think of any valid reason to configure an open access rule (other than perhaps for testing) on the TMG firewall. Creating an access rule, even for an individual system, defeats the security provided by TMG. Creating any/any access rules essentially converts the powerful TMG firewall in to a simple router. I would encourage all TMG firewall administrator to do their homework and configure the appropriate level of access required for the communication instead of opening up access to all protocols and ports.

Sometimes this is a simple as consulting documentation to determine firewall configuration requirements, but I will concede that this is the exception rather than the rule.

Often it requires profiling network traffic for nlt system or systems involved. Take the time to use a protocol analyzer to observe network traffic and analyze the communication flow to determine which protocols and ports are required.

Once you�ve done this, monitor the TMG firewall�s access logs carefully for indications of blocked traffic, as you many need to add additional protocols and ports to the access rule to ensure full functionality.Disabling Flood Mitigation � Flood mitigation is an essential protection mechanism employed by the TMG workihg to defend itself against direct attack and to ensure availability if a worm floods a protected network with traffic.

However, there are times when legitimate network traffic from some hosts will trigger the flood mitigation mechanism. I realize this can be frustrating, but resist the urge to disable flood mitigation completely! Sadly, I see this in the field more than I proxt tell you.

If you encounter this scenario, and if you have DNS servers or SMTP servers behind your TMG firewall, you almost certainly will create a flood mitigation exception policy for the host that is exceeding the default flood mitigation thresholds.

For more information on flood mitigation configuration, click here.Requiring Authentication on Web Proxy Listener � This common configuration mistake can result in some unexpected behavior on the TMG firewall.

This is an odd setting, because if you attempt to enable this configuration the TMG firewall actually complains about it! TMG warns the administrator that the best way to require authentication is on the access rule itself.

To accomplish this, simply configure the access rule to use something other than �all users�. At a minimum, specify the �all authenticated users� group and TMG will require authentication for those requests.

Configuring authentication on the TMG firewall in this manner allows the owrking to also configure specific access rules for anonymous access, if required. Often anonymous access is required for access to sites like Windows Update, because systems will check for updates without requiring a user to be logged on.Creating Deny Rules for All Traffic to Domain Name Set � This is a pretty serious configuration error that can drastically impede the performance of your TMG firewall.

The goal of using such a rule is an admirable one � preventing access to a specific set of resources, often because they are malicious. However, you have to take in to consideration how the TMG firewall processes requests against worikng policy.

In the case of a domain name set, TMG is looking to match the request to the tmg web proxy not working domain name set. If, for example, we are blocking access to evil.example.com, a web proxy request will include evil.example.com in the HTTP host header.

TMG evaluates this field and compares it to the name included in the domain name set. The challenge is matching this for requests that are from Firewall Client or SecureNAT clients. In these cases, the client sends only an IP address to the TMG firewall. In order to determine if this request matches an entry in a domain name set, the TMG firewall performs a reverse DNS lookup on the IP address to obtain a host name.

If there�s a match, traffic is allowed. How often does the reverse lookup result in the same name as the initial request? Hardly ever! Too often PTR records (used to map IP addresses to names and used in reverse DNS lookups) are missing or incorrectly configured.

More commonly they map to a different name completely because the original request is simply an alias for a group of servers. The real problem with this configuration error is in specifying all protocols. This means that for each and every packet the TMG firewall processes it will have to make a reverse DNS lookup to make sure it doesn�t match workng domain name set specified in the deny rule.

When that happens, performance can be severely degraded, especially on very busy TMG firewalls. Also, DNS servers can be overwhelmed which further contributes to performance degradation on the firewall. If you need to establish an explicit deny rule, don�t specify all protocols.

Specify only the protocols for which the TMG firewall would otherwise allow.Failing to Configure Connectivity Verifiers � If you aren�t using connectivity verifiers on your TMG firewall you are missing out on some valuable information! This is a frequently overlooked configuration option that can yield important information about the availability and health of services that the TMG firewall relies on. For more information about connectivity verifiers, click here.Ignoring Alerts � Too many administrators view the TMG alerts only when they encounter a problem!

The alert page provides a wealth of information about the status of the TMG firewall, and I recommend that you review this on a daily basis. In addition, configure e-mail notification for serious or important alerts that you want to be notified about immediately.Not Participating in the CEIP � Ok, this is really more of an annoyance thaIf you are using non-web-proxy clients with Forefront TMG, additional configuration is required so that Websense software can filter Internet requests correctly.

The term non-web-proxy clients refers to: SecureNAT clients require that you configure the default gateway so that prozy traffic to the Internet is sent through TMG. If you need information about configuring and using SecureNAT clients, see your TMG documentation. If you are using the TMG Firewall Client with the proxy server disabled, or SecureNAT clients, the ISAPI Filter plug-in must be configured to ignore requests going directly to the Tmb and to filter only tmg web proxy not working requests going out to the Internet. With the demise of isatools.org a few years ago, many Wwb Server and Forefront TMG 2010 administrators have reached out to me to ask where they can find the ISAinfo tool that was previously found on that site.

If you�re not familiar with ISAinfo, it was a great utility used for viewing the ISA or TMG configuration by parsing the configuration export. This tool is tremendously useful for providing support, as it includes all of the information required to provide context for troubleshooting. In addition it is an excellent documentation tool.So, if you�re looking for a reputable location from which to download this tool, look no further.

I�ve placed the isainfo.zip file along with the checksums for file verification on my public OneDrive. Enjoy!ISAinfo.zip � http://1drv.ms/1Q8GOaAChecksums � http://1drv.ms/1Q8GWqq Categories: Forefront TMG 2010, ISA 2006 Configuration, ISA 2006 Enterprise, ISA 2006 General, ISA 2006 Standard, Threat Management Gateway, Troubleshooting, Utilities Tags: analysis, configuration, Firewall, Forefront TMG, Forefront TMG 2010, ISAinfo, ISAtools.org, support, TMG, TMG 2010, tool, tools, troubleshooting, utility, web proxy Recently the Performance Analysis of Logs (PAL) tool was updated and now includes a threshold file for Forefront UAG 2010.

PAL is an essential utility that can make troubleshooting performance issues or capacity planning dramatically easier. I�ve written about using PAL on Forefront TMG 2010 in the past, and using PAL with Forefront UAG 2010 will be very similar. You can download the latest release of PAL at pal.codeplex.com. Categories: Forefront TMG 2010, Forefront UAG 2010, Logging and Reporting, Performance, Threat Management Gateway, Troubleshooting Tags: codeplex, Forefront, Forefront TMG, Forefront TMG 2010, Forefront UAG, Forefront UAG 2010, PAL, perfmon, performance, performance monitor, TMG, TMG 2010, troubleshooting, UAG, UAG 2010 Today I confirmed a bug in Service Pack 2 (SP2) for Forefront TMG 2010 that was discovered by Jason Jones.

If you have deleted the default Internet Access network rule and replaced it with something else, installing SP2 for Forefront TMG 2010 mysteriously restores this rule.

Unfortunately it places the default Internet Access rule ahead of your custom rule which in most cases will cause serious problems. This bug only affects Forefront TMG 2010 configurations where the default Internet Access network rule has been specifically deleted. If you�ve altered this rule in any way, those changes are unaffected.Before Forefront TMG SP2 installation�After Forefront TMG SP2 installation� Frequently I am asked to review Forefront TMG 2010 firewall logs for suspicious behavior.

Often times a security administrator will express concerns about many instances of denied requests by clients attempting to connect to Forefront TMG�s web proxy service. On busy TMG firewalls there may be hundreds or even thousands of instances where the following access denied record appears in the Web Proxy logs: Status: 12209 Forefront TMG requires authorization to fulfill the request.Access to the Web Proxy filter is denied.On a Forefront TMG 2010 firewall where web access rules require authentication, this behavior is expected and by design.

It does not indicate worjing attack of any type on the Forefront TMG firewall or its web proxy service. The root cause for the flood of tmgg denied messages has to do with how the Web Proxy client behaves when accessing resources via an authenticating web proxy like the Forefront TMG 2010 firewall.

When a Web Proxy client sends its initial request for a resource it will always attempt to do so anonymously. Only when prompted for authentication by the firewall will the web proxy client provide the credentials tjg the logged on user.Consider a scenario where Forefront TMG is configured to only allow authenticated users to access the Internet. The firewall policy might look something like this:Below is a network trace taken from a client attempting to access http://www.bing.com/ through a TMG firewall as configured above.We can see that the first three packets of the trace are the TCP three-way handshake taking place between the web proxy client and the Forefront TMG firewall.

Once a connection to the web proxy listener has been established, in packet 8 the client sends an HTTP GET request for http://www.bing.com/. In packet 13 you�ll see that the Forefront TMG firewall denied the request and replied with an HTTP 407 response, indicating that proxy authentication was required. This was done because the Forefront TMG firewall did not have any access rules which would allow the anonymous request. It did, however, have access rules that might apply to this request, depending on who the user is.

This response also includes which authentication methods the web proxy listener is configured to accept.In packet 15 the web proxy client again submits its HTTP GET request for http://www.bing.com/, this time indicating that it would like to use the NTLM Secure Service Provider (SSP). In packet 16 the Forefront TMG web proxy denies the request yet again and replies with another HTTP 407 response, this time including the NTLM challenge.

In packet 17 the client submits an HTTP GET request for http://www.bing.com/ and supplies the credentials in the form of an NTLM response.As you can see, each time a web proxy client requests a resource through worming Forefront TMG firewall that requires NTLM authentication the client is actually denied twice during the transaction before being successfully authenticated and allowed access.

If this sounds like a lot of overhead for authenticated proxy traffic, woeking are right. Denying each request twice consumes additional resources on the Forefront TMG firewall and introduces some latency for clients as well.

In addition, the burden of authenticating the user is placed on the TMG firewall when using NTLM, as the firewall itself must contact a domain controller to authenticate the user. You can reduce the authentication load on the Forefront TMG firewall considerably by enabling Kerberos authentication. When the Forefront TMG firewall is configured to prlxy Kerberos there is only a single denied request and Workign 407 response.

The client must then contact a domain controller and obtain a Kerberos ticket to present to the TMG firewall to gain access to the resource.

Information on how to configure Microsoft ISA Server and Forefront TMG 2010 to use Kerberos authentication can be found here.Additional information�HTTP response codes � http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.htmlNTLM challenge/response � http://en.wikipedia.org/wiki/NTLM An intrusion detection and prevention system (IDS/IPS) is an essential component of a modern secure web gateway. The Network Inspection System (NIS) in Forefront Threat Management Gateway (TMG) 2010 is a unique implementation of IDS/IPS.

NIS is focused specifically on detecting and preventing attacks on Microsoft operating systems and applications. NIS uses signatures that are developed by the Microsoft Malware Protection Center (MMPC) and are distributed through Windows Update or WSUS.NIS in Forefront TMG 2010 provides protection by performing low-level network protocol inspection. Each packet is analyzed for protocol state, message structure, and message content.

When a packet is received, NIS will inspect it only after the firewall policy has allowed it, and only after any associated web or application filters have processed it.There is one caveat, however. A custom protocol is not subject to NIS inspection by the Forefront TMG firewall unless it is associated with a standard protocol. Often a Forefront TMG firewall administrator will create a custom protocol for a standard protocol that uses a non-standard port. One of the most common protocols to be configured to use non-standard ports is the HTTP protocol.

For example, if an administrator defines a custom protocol to support a web-based application that uses the non-stRecently I received a call from a customer who was trying to resolve an issue where all web proxy clients that were configured to use Web Proxy Auto Discovery (WPAD) with DNS suddenly stopped working.

We began troubleshooting by confirming that the hostname WPAD proxxy to the internal IP address of the Forefront TMG firewall, which it did correctly. Next we used a telnet client to confirm that the TMG firewall was listening on TCP port 80 (used by TMG for DNS WPAD clients) and indeed it was responsive. A scan of the event logs on the firewall turned up the following warning message:� The Web Proxy filter failed to bind its socket to 172.16.1.253 port 80.

This may have been caused by another service that is already using the same port or by a network adapter that is not functional. To resolve this issue, restart the Microsoft Firewall service. The error code specified in the data area of the event properties indicates the cause of the failure.�Something was nit on TCP port 80, so we opened a command prompt and entered workking following command in order to determine which process was listening on this port: netstat �ano | findstr :80Netstat was reporting that TCP port 80 was in a listening state and bound to the IP address 172.16.1.253.

The process using this port was the System process (PID 4). This is unexpected, because the Forefront TMG web proxy service (wspsrv.exe) should be bound and listening on this port. Clearly this was a web service hijacking this port, so to find out more we entered the following command at a command prompt: netsh http show servicestateThe output of this command revealed a valuable clue.

Notice the registered URL below�HTTP://172.16.1.253:80:172.16.1.253/REPORTSERVER_ISARS/As it turns out, this customer had attempted rpoxy change the SQL Reporting Services Web Service URL. By assigning the Forefront TMG firewall�s internal IP address and changing the port to 80 in the Reporting Service Configuration Manager, this caused a conflict with the Forefront TMG web proxy filter, which requires TCP port 80 to provide WPAD for DNS.To resolve the issue, the administrator chose a TCP port other than 80 and restarted the system. @richardhicks�RT @ ExchangeGoddess: Any ladies going to #MSIgnite that want a female buddy to hangout and have dinners DM me.

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The term non-Web-Proxy clients refers to: SecureNAT clients require that you configure the default gateway so that all traffic to the Internet is sent through ISA/TMG.

If you need information about configuring and using SecureNAT clients, see your ISA/TMG documentation. If you are using the ISA/TMG Firewall Client with the proxy server disabled, or SecureNAT clients, tmg web proxy not working ISAPI Filter plug-in must be configured to ignore requests going directly to the ISA/TMG and to filter only those requests going out to the Internet. Training� Expert-led, virtual classes� Training Catalog� Class Locator� Microsoft Virtual Academy� Free Windows Server 2012 courses� Free Windows 8 courses� SQL Server training� Microsoft Official Courses On-Demand Applications making requests as Web proxy clients can bypass the Web proxy filter and directly access resources.

Typically, this is required to allow clients to access resources located in their local network or to allow clients to access external Web sites without going through Forefront TMG. Web proxy clients can be configured for direct access as follows:�Client nit that do not use automatic detection by means of an automatic configuration script or a Web Proxy Automatic Discovery (WPAD) entry must be configured manually for direct access.

For more information about automatic detection, see About automatic discovery.�Client browsers configured to use a Forefront TMG automatic configuration script can obtain direct access information.If a request that bypasses the Web proxy filter is for resources that are not tmg web proxy not working the client network, you can configure the client as either a SecureNAT client or Firewall client. This allows Forefront TMG to handle the request and to apply traffic inspection and filtering. This procedure assumes Windows Internet Explorer as the Web browser.

To configure Web browsers to use the automatic configuration wotking, do the following.To configure Web browsers to use the automatic wkrking script�In Internet Explorer, click the Tools menu, and then click Internet Options.�Click the Connections tab, and then click LAN Settings.�Select the Bypass proxy server for local addresses check box to configure the browser not to forward requests for host names (for example, http://webserver) to the Web proxy filter.

This option is only available for single label names. Names or addresses with a period (.), such as IP addresses of a fully qualified domain name, are forwarded to the Web proxy filter.

These types of entries should be specified in the Exceptions list, as follows:�Click Advanced, and then in the Exceptions list, type in the domain name or IP address you do not want handled by the Web proxy filter. Direct access settings configured in Forefront TMG�are delivered to clients in an automatic configuration script every six hours.

Internet Explorer can specify the static location of the script or use the WPAD protocol in order to discover a server on which the configuration script is located. For instructions about configuring workimg, tmg web proxy not working Configuring Web browsers for automatic detection. Direct access settings are configured in the Forefront TMG Management console, as follows.To configure direct access settings�In the Forefront TMG Management console, click Networking.�On the details pane, click the Networks tab.�Right-click the required internal or perimeter network, and then click Properties.�On the Web Browser tab, do one of the weg Bypass proxy for Web servers in this network to specify that Web proxy clients should bypass the Web proxy filter for Web servers located in the client network.�Select Directly access computers specified in the Domains tab to allow Web proxy clients to bypass the Web proxy filter for destinations specified on the Domains tab.�Select Directly access computers specified in the Addresses tab to allow Web proxy clients to bypass the Web proxy filter for destinations on the Addresses tab.

By default, the Addresses tab contains the IP address range of the network.�Select Add to specify an IP address range, domain, or computer to access directly. To remove an entry from the Directly access these servers or domains list, select it, and then click Remove. To modify an entry on the list, select it, and then click Edit.�Select Direct Access to specify that Web proxy clients should bypass the Web proxy filter if Forefront TMG is unavailable. To configure a domain for direct access�In the Forefront TMG Management console, click Networking.�On the details pane, click the Networks tab.�Right-click the required internal or perimeter network, and then click Properties.�On the Domains tab, do one or more of the following:�To add an entry, click Proxg, and then type in a domain for direct access.

Repeat for each domain you want to add.�To remove an entry, in the Domain names list, click the entry you want to remove, and then click Remove.�To nkt an entry, in the Domain names list, click the entry you want to modify, and then click Edit. Training� Expert-led, virtual classes� Training Catalog� Class Locator� Microsoft Virtual Academy� Free Windows Server 2012 courses� Free Windows 8 courses� SQL Server training� Microsoft Official Courses On-Demand This section provides information about configuring automatic detection of Web proxy settings for Web proxy client applications.

Microsoft Forefront Threat Management Gateway provides automatic detection by means of an automatic configuration script or by using a WPAD entry in DNS or DHCP. Microsoft Forefront Threat Management Gateway can act as a WPAD server for Web proxy clients.This section includes the following topics:� Configuring a WPAD server� Creating a WPAD entry in DHCP� Creating a WPAD entry in DNS� Removing WPAD from DNS block list� Configuring Firewall clients for automatic detection� Configuring Web browsers for automatic detection It was almost 6:00 pm on Friday evening and I was setting my mind on what to do with my weekend when suddenly the phone rings.�Hey Uilson, please help us!

We are getting an error to access the internet!�OK! Time to stop dreaming about weekend plans and find out what is going on!I quickly confirmed�from my notebook that internet access was down and Internet Explorer was returning the error message below: ErrorFW-1 at fw6057: Access denied.Requests were being redirected to our edge firewall. Network ConfigurationThe network used two Eorking TMG in Network Load Balanced (NLB) configuration and all browsers�received�proxy details via WPAD.DAT script, delivered by GPO from our Active Directory servers.

TroubleshootingWhen setting the web proxy wfb manually in Internet Explorer using the IP and port of the Forefront TMG proxy woking, Internet access was restored! This narrowed the problem down to an issue with the WPAD.DAT script. Investigating WPADI went to Internet Explorer and tried to download the WPAD script by typing�its address into my browser: http://server.domain.com/wpad.datI found I could not access this link.

Then, remembering some advice I received from one of our Field Analysts, I tried accessing the script via port 8080: http://server.domain.com:8080/wpad.datSuccess! I could download script.I tried manually setting one of the workstations to download the script using port 8080, and�it was able to access the internet again!OK my friends! I�ve found what was wrong! The Forefront TMG�Server was refusing requests to the WPAD.dat script on port 80. SolutionThe reason why Internet access suddenly dropped was that someone made a change to Forefront TMG�s Internal network properties and disabled the access via port 80 by unchecking the �Publish automatic discovery ont for this network� option, as shown in the image below:When checking this option again, all users got their Internet access back!

About Web Proxy Auto Discovery prpxy �Publish automatic discovery information for this network� option in Forefront TMG allows access to the Web Proxy Automatic Discovery (WPAD) protocol. All you need to do is configure a host record in DNS called WPAD that resolves to the IP address of your Forefront TMG�s internal network interface.The WPAD method can pose potential security issues, so Microsoft added WPAD to the default Global Query Block List in Windows Server 2008.

This means that the DNS service will not respond to WPAD queries by default. It is possible to turn this method on by following some steps that my friend Richard Hicks describes in his post: DNS Security Enhancements and Proxy Auto Discovery.The best way to deploy the WPAD script is keeping the gmg link provided by Forefront TMG. In case you want to set up a customized link, always create it using port 8080 as default. For example: http://proxy.uilson.com:8080/wpad.datUsing an address like the one above won�t impact users if someone unchecks the Automatic Discovery publishing option.You also need to be sure the script address on Forefront TMG matches what you have specified in Active Directory GPO.

Further WPAD TroubleshootingLuckily, my issue was easily solved by re-publishing the Auto Discovery service on Forefront TMG. If you are having other issues with WPAD on Forefront TMG and this article does not help, here are some other WPAD troubleshooting resources you may find useful:Troubleshooting Automatic Detection (Forefront Operations Documentation) http://technet.microsoft.com/en-us/library/cc302643.aspxForefront TMG Web Proxy Auto Detect Fails (Richard Hicks) http://tmgblog.richardhicks.com/2011/05/23/forefront-tmg-2010-web-proxy-auto-detect-fails/Troubleshooting Windows Proxy Auto Discover � WPAD (Infratalk) http://infratalk.wordpress.com/2011/09/10/troubleshooting-windows-proxy-autodiscovery-wpad/Automatic Discovery Woes (Forefront TMG Product Team Blog) http://blogs.technet.com/b/isablog/archive/2006/01/04/416887.aspxWPAD is Working Or Not (Suraj Singh MSFT) http://blogs.technet.com/b/sooraj-sec/archive/2011/07/07/wpad-is-working-or-not.aspxPosted in Web Proxy Auto Discovery, WPAD, WPAD Auto Discovery Uilson SouzaSenior IT Consultant and Technical Evangelist in Brazil working at design, planning and deployment of Microsoft products and conducting presentations and webcasts regarding to proxy and reverse proxy tecnologies.

I have been implementing Microsoft solutions since 1995, such as Windows Servers, Failover Clustering, Hyper-V, IIS Web Servers and other related technologies. I also write articles for Microsoft TechNet at the TechNet Wiki Portal and at my personal blog - http://uilson76.wordpress.com.

I?m an ISA Server 2006 MCTS (Microsoft Certified Technology Specialist) and an active Microsoft Technical Audience Contributor (MTAC) since 2011. uilson76.wordpress.com/Follow me on twitter � Latest Articles� Simplify Forefront TMG Migration By Web Chaining To An Upstream Proxy� Finding a Forefront TMG replacement is more urgent than you thought� How To Secure Fastvue TMG Reporter for Private Report Sharing� Fastvue TMG Reporter v3.0 Weh Now!� How to Fix Web Application Proxy and AD FS Certificate Issues (Error Code 0x8007520C)



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