We are running Windows Server 2008 r2 Enterprise, One of the roles is for Remote Desktop Services. We run 2 terminal servers for our 2 branches. The access is also over a VPN tunnel. Each branch has their own router that connects back to us at the main branch One server, started about a week ago or something causes the users to be disconnected. They tell me they don't get any error messages, they just go back to their PC and the icon for the remote session is gone.... Nothing has changed in any settings. They have to restart a new session and then get back in. It has happened several times in a day. They tell me it is all users when it happens.
I have no idea where to start to see what is happening.
I have tried finding something in the logs and don't see any specific warnings in the time frames,
Can someone give me some assistance on how to trouble shoot why this is happening? Or other questions I should be asking the users to help pinpoint it?