Troubleshooting the installation

Updated: February 1, 2011

Applies To: Forefront Threat Management Gateway (TMG)

This topic provides guidance for diagnosing and resolving installation issues you may encounter with Forefront TMG when:

  • Upgrading to Windows Server 2008 R2

  • Installing from a network drive

  • Group Policy enforces Windows Firewall


For the complete flow of troubleshooting Forefront TMG installation problems, download the Troubleshooting Forefront TMG Services SuperFlow ( at the Microsoft Download Center.

Upgrading to Windows Server 2008 R2

If you installed Forefront TMG on a computer running Windows Server 2008, and you want to upgrade the operating system to Windows Server 2008 R2, you must perform a clean installation of Windows Server 2008 R2. The supported upgrade path is:

  1. Export the Forefront TMG configuration.

  2. Perform a clean installation (not an upgrade) of the new operating system.

  3. Install Forefront TMG.

  4. Import the Forefront TMG configuration.

Installing from a network drive

If you are running the Performance Tool or Setup from a shared drive, make sure that the computer automatically reconnects to this drive after system restart. These two applications may require or initiate a restart, and failure to locate them after restart may result in a failed installation.

Group Policy enforces Windows Firewall

When installing Forefront TMG on a computer that is joined to a domain with Group Policy object (GPO) enforcement of Windows Firewall, the installation will not complete successfully because Setup tries to disable the Windows Firewall. As a workaround, you can direct Setup to ignore this error by adding a flag to the Windows Registry, as follows:

  1. Open the Windows Registry using the command regedit.


    It is recommended that you back up the registry before making any changes.

  2. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RAT\Stingray\Debug\SETUP.

  3. Right-click IGNORE_WINDOWS_FIREWALL_GPO_ENFORCEMENT, select Modify, and change the Value data to 1.


Forefront TMG Troubleshooting