I am unable to log on to my servers remotely using either RDP or Citrix/ICA unless a user is logged on to the domain locally, i.e. sitting at their desk. Basically, when the last person leaves for the day until the first person logs in, I am unable to log in remotely using Remote Desktop or a Citrix ICA Client. BUT after someone logs in at their desk, I am able to connect using either method. I can log on to my firewall and ping all the servers during the time that I am unable to connect to them.
The only changes have been an Exchange 2007 server added, an upgraded Citrix License console version, and an upgrade to our practice management software called Time Matters. The exchange server hasn't been brought up yet in production but is running.
To me, it seems like there is something installed that is basically shutting down terminal services once the last user logs off. I have rebooted everything including network equipment several times. This happened with no change to hardware, software or configuration of the network. Please send questions and hopefully an answer!