Host-based backup of Microsoft Hyper-V VMs.
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BrianBuchanan
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[V13] Backups of VMs on Server 2025 Hyper-V are failing

Post by BrianBuchanan »

Case #07824858 but V13 is so new I thought I'd ask here too.

I've built a fresh V13 environment parallel to my V12, using the VSA, several local usb drive repositories, and a pair of new hardened repositories, and successfully migrated about 13 Hyper-V servers running Server 2022 Standard to it.

However the first four of my Windows Server 2025 Datacenter (Evaluation) Hyper-V hosts are all failing to backup after being migrated to V13 (they were fine under V12). There are errors in the host Application Event log indicating that VeeamAgent.exe is crashing. (These are evaluation only because we were waiting for our production licenses to arrive)

Another note is that I've built the V13 environment out on its own separate vlan (while the hosts stayed on the old vlan), and I can't be certain that the intervlan firewall isn't causing problems. I think all the required ports are open now, ping works, test-netconnection -port tests are successful; but could a firewall issue would cause the app the crash?

Code: Select all

Faulting application name: VeeamAgent.exe, version: 13.0.0.4967, time stamp: 0x68a7b64e
Faulting module name: RansomwareStats.dll, version: 2.0.0.92, time stamp: 0x681b8fa5
Exception code: 0xc000001d
Fault offset: 0x0000000000017672
Faulting process id: 0x2DCC
Faulting application start time: 0x1DC271A218D962E
Faulting application path: C:\Program Files\Veeam\Backup Transport\x64\VeeamAgent.exe
Faulting module path: C:\Program Files\Veeam\Backup Transport\x64\RansomwareStats.dll
Report Id: 9356010f-9413-41b3-ad12-5bcad2bc5d7b
Faulting package full name: 
Faulting package-relative application ID: 
As per support's first response I've manually reinstalled the Backup Transport and rebooted the Hyper-V host and resubmitted logs and I'll be waiting for them to take a deeper look.

Thanks,

Brian
PetrM
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Re: [V13] Backups of VMs on Server 2025 Hyper-V are failing

Post by PetrM »

Hi Brian,

I doubt that it is possible to troubleshoot this issue by exchanging messages in this forum thread. It appears to be a complex problem, and analyzing debug logs and process dumps will likely be necessary. I don't think it is related to the firewall, in most cases, the error code 0xc000001d indicates outdated drivers, damaged system files, or conflicting antivirus software. On the other hand, we cannot completely rule out the firewall, I just believe it is unlikely. Anyway, let’s wait for the results from our support team.

Thanks!
BrianBuchanan
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Re: [V13] Backups of VMs on Server 2025 Hyper-V are failing

Post by BrianBuchanan » 1 person likes this post

Support was able to provide a work-around. I added all the VMs on the Windows Server 2025 Hyper-V hosts to the Global Exclusions for Malware Exclusions and the backups completed successfully.
Dima P.
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Re: [V13] Backups of VMs on Server 2025 Hyper-V are failing

Post by Dima P. »

Hello Brian,

We will review your case details internally with malware detection team! Thank you for the heads up!
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