Bunch of servers VSS Writer Errror 0x800423f4

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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby bertus02 » Thu Nov 09, 2017 3:36 pm

Good morning, I can cofirm that a temporary stop of the Microsoft Azure AD Sync service during the backup window stopped the VSS errors. I also just installed Server 2012 Express LocalDB sp4 to see if that will superess the VSS errors. Here is a link to the SP if anyone is interested.

https://www.microsoft.com/en-us/download/details.aspx?id=56042
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby dnorth » Fri Nov 10, 2017 10:11 am

bdufour wrote:Changing the service account seems to be working for me. The first Veeam job after an Auto (non-)Upgrade completed without an error anyway. Thanks, Blake.


no problem, i still haven't had to restart this server and all jobs for it are still completing without any errors. at this point, i don't think it's just a coincidence and this may have fixed the issue on my end.[/quote]

OK, I spoke too soon. It worked OK for about a day and a half, then same old error.

Btw, stopping and restarting the localdb seems to be just as effective as restarting the VM.
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby Peter Just » Fri Nov 10, 2017 2:31 pm

Has anyone found a solution to this one? Multiple customers have been hit with this recently. I haven't had luck with the script provided. Some have suggested updating SQL Express. Is that the best fix?
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby bdufour » Fri Nov 10, 2017 4:08 pm 1 person likes this post

still havent had an issue on my end. but it looks like if i do i will upgrade sql to sp4, bc thats the only other thing ive seen offered here i havent tried yet. btw ive had instances where restarting the service(s) fixed the issue without restarting the server, but i also had instances where it didnt fix it and i had to restart the server anyway. its very strange, this issue, and hard to make sense of... also, another user posted (recently) repairing the db, i tried that first and it worked for a few days and eventually errored again - so its a temporary fix according to my judgment.
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby Marius_Aad » Fri Nov 10, 2017 4:32 pm 1 person likes this post

Marius_Aad wrote:Upgrading MSSQL Server 2012 Express LocalDB to SP4 fixed the issue for me. Multiple back up jobs finished successfully after that without restarting the vm.


After a couple of days without problems the issue is back again :evil: . So upgrading wasn't a permanent fix either.
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby bdufour » Fri Nov 10, 2017 5:39 pm

im at day 10 since ive went the service account route with no issues while replicating or backing up the server. the domain service account has local admin rights on the server - we also use this same account for veeam to interact with the vms while processing (why it has local admin rights to the server- requirement via veeam for application-aware image processing). we use service accounts anywhere possible. (for your understanding this account isnt a domain admin account....)
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby hyvokar » Mon Nov 13, 2017 7:01 pm

hyvokar wrote:Faced this problem again last week. Finally got fed up randomly rebooting servers dunring day time and scheduled a daily reboot every night just before backup. This workaround sucks just a little bit less than manually rebooting every time backup fails.

Have had no issues after reboot script, will keep you posted.
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby ibauersachs » Mon Nov 13, 2017 9:35 pm 1 person likes this post

In case you’re wondering why this happens:
– ADSync launches an SQL Server Local DB under it’s own user account
– The User Profile Service thinks ADSync is no longer logged on, and unloads the registry
– SQL Server though still has handles to the registry, but they’re invalid now

Detailed explanation:
https://support.microsoft.com/en-us/hel ... hen-a-user

In short: Computer Configuration->Administrative Templates->System->User Profiles->Do not forcefully unload the user registry at user logoff->Enabled
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby mamosorre84 » Mon Nov 20, 2017 8:30 am

ibauersachs wrote:
In short: Computer Configuration->Administrative Templates->System->User Profiles->Do not forcefully unload the user registry at user logoff->Enabled


Is this a resolutive workaround?
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby mcz » Mon Nov 20, 2017 8:35 am

...after 2 weeks without any issues the original problem came back and now I have applied the suggested local group policy. I will let others know if it helped...
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby bdufour » Mon Nov 20, 2017 6:18 pm

im at day 20, with no issues since my original post. i will be restarting this server this weekend before we run nessus (monthly thing).
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby stijnw » Thu Nov 23, 2017 10:17 am

I found that reinstalling/repairing the sql express database isn’t needed if:

Before creating the snapshot you stop the microsoft azure ad sync service (pre-freeze)
After snapshot is created, start the service again (post-thaw)

I added the backup service account start & stop rights with this tool:
https://www.coretechnologies.com/produc ... ityEditor/

Found this tool via this blog:
http://davidcocke.blogspot.be/2015/10/c ... am_18.html
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby nicold » Thu Dec 07, 2017 8:39 am

I was experiencing this issue, after Microsoft Update patching and a reboot of the Hyper-V server, which is also running Veeam B&R, I saw the warning disappear. I have Server 2012 Hyper-V. Rebooting of the VM with Azure AD Connect only resolved the issue for 1 backup, as described above but the reboot of Hyper-V is what worked for me.
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby dnorth » Mon Dec 11, 2017 10:57 am

ibauersachs wrote:In short: Computer Configuration->Administrative Templates->System->User Profiles->Do not forcefully unload the user registry at user logoff->Enabled


Thanks. That seems to be working for me. No errors for 3 days. The explanation makes sense too.
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Re: Bunch of servers VSS Writer Errror 0x800423f4

Veeam Logoby mcz » Mon Dec 11, 2017 12:55 pm

ibauersachs wrote:In short: Computer Configuration->Administrative Templates->System->User Profiles->Do not forcefully unload the user registry at user logoff->Enabled.


This was working for me too. Thanks for sharing!
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