We're having a issue with disconnected RDC sessions dropping after 1 minute on all 2008 x64 boxes. We have a 3rd party vendor that needs to run an app on our SQL Svr in a disconnected session. Apparently they're unable to run this as a service.
I've checked Group Policy, Local Policy and RDP Connection settings and all match both at system and user. RDP is set to override user setting with 'never' on all. We're running a mixed 2003/2008 environment with one 2003 DC and one 2008 DC. In testing we have the same issue with all our 2008 x64 boxes. This isn't an issue on any of our 2003 servers. It may also be worth noting we're running these servers on VMware ESX 3.5 hosts.
We've tried various versions of RDC and also connecting using IP rather than name. We're only trying this with selected Remote Desktop users and domain admin account right now.