freeze/thaw VSS failures when Sophos AV is utilized

Question

Unitrends has an article (5520, https://support.unitrends.com/UnitrendsBackup/s/article/ka040000000PmjMAAS/000005520?_ga=2.69789140.576488646.1505169382-1745831295.1501935182 ) on getting freeze/thaw VSS failures on devices running Sophos A/V when doing backups. 
 I've got one server experiencing this with Unitrends. I've got another server with Windows Server Backups that keep failing , but I haven't tried uninstalling Sophos on the 2nd one yet to verify that this this the same issue. 
 
 is there any official word from Sophos on this? Has anyone else experienced this?

JamesGolden · Answer

I've opened a case with Sophos last month. Apparently its been escalated to development, but so far no fixes that I've heard of. the workaround that works for me now, and as per Sophos Support is:

1. Disable Tamper Protection on the affected servers 
 2. Open Services.msc on each server 
 3. Stop and Disable the Sophos Health service 
 4. Reboot server and test backups

Gowtham Mani · Answer

Hi Everyone, 
 The reported issue (WINEP-8974) is being worked by development and we are awaiting an update from Mircosoft on this. We will be updating this thread with further developments.