Troubleshooting TMG URL Filtering Failures

So the URL filtering on your TMG firewall stopped working. You see the error in the TMG firewall console:

“The failure is due to error: A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider.

Description: An error occurred while trying to communicate with the Microsoft Reputation Service server. If this Forefront TMG server is chained to an upstream server, verify that the WinHTTP proxy is set to localhost. If this issue persists, check that Internet connectivity is available…”

What’s up with that?

Find out what’s up with that on the TMG Firewall team blog over at:



MVP (Enterprise Security)
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