I have a newly installed 2012R2 server. I am running four (4) virtual machines under Hyper-V. Every time I go to do something with setting on one of the machines, or create a new machines I get errors saying that I was unable to complete the job - no reason give, just fails.

I have found that if I go into services and restart the Hyper-V Virtual Machine Management service, everything works for a period. I have noticed that the VSSWriter for Hyper-V goes off line with a failed (8) on the vssadmin list output. At this point my backups also start to fail and I get 'Catastrophic failure (0x8000FFFF)' errors in the event log for all four (4) VMs.

I have checked the versions of integration services using the powershell script from the virtual_pc_guy archives (sorry, the system would not let me embed the link here) and all show as up to date.

I have also checked and all VMs have at least 90GB of free disk space.

This is frustrating me no end and is delaying the upgrades to our other two (2) servers currently running Hyper-V under 2008R2.

Any suggestions greatly appreciated.

• Edited by rossbofh 2 hours 14 minutes ago