We are seeing a seemingly-random problem cropping up throughout our environment with our Windows VMs. They will run fine for weeks or months at a time, but then - although they still seem to be performing their assigned business functions - they will stop accepting RDP connections. At the same time, our monitoring will tell us:
RPC Service status on server.domain.com Remote Procedure Call (RPC)(Unknown), Distributed Transaction Coordinator(Unknown)
Please check this server for a possible hung OS condition.
When I try to access these VMs via the remote console, I can apparently logon... but the server never shows me more than a black screen. Trying to Restart Guest OS results in "A general system error has occurred: Invalid fault". At that point, I can either power down the VM or reset it, and when it comes back - which they always have, so far - RDP connections work again and the RPC errors go away. When I logon via remote console, I see the Windows desktop I expect.
These servers will run fine again for a few weeks or months, but then this problem with reoccur.
No one here has the slightest idea of why this is happening. There is nothing we've been able to see in Event Viewer that seems to to relate to this. Has anyone else seen this sort of behavior? Can anyone suggest something to look for?