Dear TMG Community,
Since yesterday (22/1/14) a client of ours has been experiencing an issue with TMG and the Microsoft Reputation Service.
The following event is intermittently logged to the Application Log:
Event ID: 31524
"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."
Further troubleshooting has revealed an issue with one of the hosts behind the 10.ds.mrs.microsoft.com DNS record.
10.ds.mrs.microsoft.com --> 207.46.60.244 (HTTPS not working)
10.ds.mrs.microsoft.com --> 207.46.60.245 (HTTPS working)
10.ds.mrs.microsoft.com --> 65.55.74.113 (HTTPS working)
We experience an event each time TMG attempts to connect to 207.46.60.244. This is consistent across several ISPs/upstream DNS providers. For now, we've entered a static hosts file entry on the TMG servers to avoid the many SCOM alerts.
Could someone at Microsoft please look into this and advise once the issue is resolved.
Kind regards,
David Barrett