vss "system writer" non-retryable error with sbs2008 server

We have a problem running our Barracuda Yosemite server backup on our single Windows sbs2008 server.

I have spoken with Yosemite, who tell me the problem is with our vss writer.

I have re registered the vss dll's and restarted the server, but we are still getting the un-retryable error when we run vssadmin list viewers.

Retarting seems to clear it, but soon after the non retryable error returns.

I can see in the event log :-

Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface.  hr = 0x80070005. This is often caused by incorrect security settings in either the writer or requestor process.

Operation:
   Gathering Writer Data

Context:
   Writer Class Id: {e8132975-6f93-4464-a53e-1050253ae220}
   Writer Name: System Writer
   Writer Instance ID: {2bb16dee-be6f-4bce-b6bd-d1d0e45c3196}

Can anyone advise what we need to do to bring about a stable system writer, so that we can get a reliable backup??
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nigelbeatsonAsked:
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nigelbeatsonAuthor Commented:
Additional info

I note that there are repeat entries in our event log with same vss 8194 error but for different services, and they appear one after the other, as follows :-

SharePoint Services Writer
NPS VSS writer
SharePoint Services Writer
System Writer
NPS VSS Writer
System Writer
SharePoint Services Writer
NPS VSS Writer
NPS VSS Writer
SharePoint Services Writer
System Writer

Then they stop.

All writers are stable at the moment, but it seems that every few days the same problem arises, so any help in getting to the bottom of it, would be much appreciated.

Thanks.
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Pradeep DubeyConsultantCommented:
copy and past entire log content here.

Check if you are getting same error as given in the below link:
http://answers.microsoft.com/en-us/windows/forum/windows_7-system/volume-shadow-copy-service-error-in-windows/7fed0a82-7f30-4e3d-a973-4cac492f8766
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nigelbeatsonAuthor Commented:
I came accross thsi while I was waiting, and thought it might help, and I will test this and let you know whether it works OK.

http://help.remote-backup.com/index.php?/Knowledgebase/Article/View/327/0/eliminating-vss-error-8194-from-event-log

Not sure whther I need to do anything else apart from paste the link??

Will check out the link offered by pradeep08_81

Many thanks.
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Pradeep DubeyConsultantCommented:
nigelbeatson,

I have given you a link which has answer and your link is also having an answer but from the other site not from MS.

Solution is included in the link.

So you can not say I have not given solution, you can say you solve it by your own link.

open both link and compare the solution

Given by me :

http://answers.microsoft.com/en-us/windows/forum/windows_7-system/vss-error-showing-in-event-viewer/34b62c1b-93e6-4848-a9a0-59e3f4019ebb


By you:
http://help.remote-backup.com/index.php?/Knowledgebase/Article/View/327/0/eliminating-vss-error-8194-from-event-log
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nigelbeatsonAuthor Commented:
My own solution seems to have resolved this issue. Thanks to all.
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