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Troubleshooting: ForeFront TMG “Unable to Listen on Port 80 (No IIS wasn’t Installed)”

This post explains a scenario where a service other than IIS grabs web ports used by TMG causing publishing rules to fail. “Consider the scenario where a TMG 2010 Server is installed as Hyper-V guest on a Windows 2008 Server. You publish a website on port 80 or enable HTTP to HTTPS redirection on a Web Listener for an existing SSL publishing rule. When you try to access the published website you get an error: 10060 Connection Refused,” explained Microsoft.

Troubleshooting: A quick look at TMG Live Logging reveals following:

Netstat output indicates that Process ID 4 (System) is listening on port TCP 80 as shown below:


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