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freeze/thaw VSS failures when Sophos AV is utilized

JamesGolden

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? 

 



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    We're having a similar issue with Unitrends backup at our remote site. The Unitrends backups fail intermittently for our servers and there is no apparent rhyme or reason. Running the command vssadmin list writers form an elevated command prompt always shows several of the vss writers in a failed state, including the System Writer.

    Sophos answer is to add the following exception to the servers' policy:

    \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy*\ or GLOBALROOT\Device\HarddiskVolumeShadowCopy*\

    Note: per Sophos support, it does not work if you add it to the global exceptions

    http://sophos.com/kb/126726

    Unfortunately, this solution has not worked for us and the problem appears to be getting worse with backups failing more frequently.

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    We're having a similar issue with Unitrends backup at our remote site. The Unitrends backups fail intermittently for our servers and there is no apparent rhyme or reason. Running the command vssadmin list writers form an elevated command prompt always shows several of the vss writers in a failed state, including the System Writer.

    Sophos answer is to add the following exception to the servers' policy:

    \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy*\ or GLOBALROOT\Device\HarddiskVolumeShadowCopy*\

    Note: per Sophos support, it does not work if you add it to the global exceptions

    http://sophos.com/kb/126726

    Unfortunately, this solution has not worked for us and the problem appears to be getting worse with backups failing more frequently.

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