Summary
Hyper-V backup fails with "Error during start of VSSBar"
Error
Hyper-V backup on a multinode cluster fails with:
[Normal] From: VEPALIB_HYPERV@hostname "HyperV" Time: 12/12/2017 3:29:34 PM
Starting backup of VM(s) ... :
'VM_NAME (GUID: VM_GUID)' on host 'node04.domain.com' - Full
[Major] From: VEPALIB_HYPERV@hostname "HyperV" Time: 12/12/2017 3:29:34 PM
Error during start of VSSBar.
Cause
Client Security feature was misconfigured
Fix
1. Rename/Remove C:\ProgramData\OmniBack\config\client\allow_hosts on all Hyper-V cluster nodes.
OR
2. Configure properly Client Security by adding all Hyper-V node names in each other's C:\ProgramData\OmniBack\config\client\allow_hosts files.