Two of our Dell PowerEdge 2650's with Windows Server 2003 SP2 EE are experiencing this issue (usually after windows update reboots the computer overnight).
I am unable to RDC, remote manage, or connect to any file shares, however, i can ping the server. When I walk up to the server console I find it at a grey screen where i am able to move the mouse, however any keyboard input is ignored. At this point i must reboot the server and then everything is fine.
What i've checked on each server:
-lsass.exe is still present on both machines
-Checked my antivirus logs and lsass.exe was never touched
-Ran chkdsk and sfc /scannow
I've even converted on of the servers to a virtual machine and the same issue is occurring. Anyone have any ideas here?