A customer has a Windows Server 2008 r2 virtual machine running on a VMWare host (5.1). They are having intermittent (1 or 2 times a month) issues where my network application becomes unresponsive. When the site admin tries to remote desktop into the VM, it fails. When she tried accessing through VSphere's console, it gave her a login window, took her username/password, and returned her to the login screen without any error messages. This seems like a clue as to what is locking up the VM, but I'm not sure what it means.
It seems like at least one subsystem is still working, but maybe not some other one.
From the VSphere usage logs, there are no spikes in memory or CPU usage.
Any suggestions as to what the "clue" might mean? Which Windows systems are working and which aren't? How should we figure out what's going on? (Tools/strategies/etc) Thanks for your help.
EDIT: One bit that I forgot is that once she resets the VM in VSphere, the VM operates normally. I'll see if she remembers what the RDP error was or if it even gave one.