Greetings!
We have a Windows 2008 R2 Standard edition running as a remote desktop gateway server for a Windows 2003 R2 Standard Remote desktop Server. It has been up and running for more than three years with no issues until this Monday.
Only the domain administrator user can connect via Remote desktop gateway. All other users get the "The logon attempt failed" error message.
Please note the if the users do NOT use the remote desktop gateway configuration they connect just fine on the terminal server.
Attached below are the security updates that were installed in the weekend before the issue. Uninstalling them had no effect.
It appears to be an issue with RPC over HTTP but I am not sure if any of the updates changed any settings and broke the configuration.
The connection and resource CAPs have not been changed and the users that have issue connecting are still part of the allowed groups.
Please also note that there is no http redirection setup on the IIS server. That was a common issue causing the same error doing my research. This does not seem to apply here.
Using a backup connection that does not utilize remote desktop gateway is not a desirable configuration.
Any insights welcome.