We receive the below error in VM backup job statistics if Trend Micro antivirus is loaded in both of guest VM OS and its Hyper-V host OS:
1/18/2018 1:14:09 PM :: Failed to create snapshot (Microsoft CSV Shadow Copy Provider) (mode: Hyper-V child partition snapshot) Details: Writer 'Microsoft Hyper-V VSS Writer' is failed at 'VSS_WS_FAILED_AT_PREPARE_SNAPSHOT'. The writer experienced a non-transient error. If the backup process is retried, the error is likely to reoccur. --tr:Failed to verify writers state. --tr:Failed to perform pre-backup tasks.
If we unload Trend Micro from both, backup goes smoothly. We followed this article to configure the AV exclusions: https://www.veeam.com/kb1999
but the same issue persists.
Any suggestion will be much appreciated.