Potential bug with Windows VM backup: "Body Timeout Error"
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@MajorP93 It's being packaged at the moment. between this and the testing that needs to be done it might take a couple of weeks to be released, but I can't promise anything yet
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I had same problem, about last 2 weeks, but is is about Xen update, after apply last update, Backup of Windows VMs works again.
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The update mentioned by Pau should has just been released along with other updates. For more information, you can consult the corresponding blog post: https://xcp-ng.org/blog/2026/03/10/march-2026-maintenance-updates-for-xcp-ng-8-3-lts/
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Amazing timing. I have been having this issue with a VM I just set up and I came here to find out if this is a known problem, only to discover that the 97 patches I have been planning to install tonight are going to fix it.
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Did anyone try to patch xo and xcp-ng to the latest and did you have any luck with backups since then?
Im on XO (Xen Orchestra, commit 449e7 and Master, commit 2aff8) and the latest xcp-ng 8.3 with all patches installed and im still seeing the "Body timeout error" on 4/8 vm's:
Some works tho:
Observium has a 20Gb VDI with 15Gb used, jupiter has a 20Gb VDI with 12Gb used.
Let me know if you want any logs from my XO or XCP and I'll happily provide them. -
@nikade I did install the 97 XCP patches and that night the VM that was failing to backup was able to successfully backup. It had a 500GB secondary drive that was formatted but totally empty.
I had not yet patched my XO from source to the latest, it was maybe 24 commits behind. On Friday I updated it so I will find out on Monday if those backups continued to work but I assume they did.
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@CodeMercenary alright, thanks for replying. I tried some more, but still getting the same error, on linux as well as windows vm's so im at lost here.
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@nikade Hey Nikade,
Did you try to create a new job that will do a new chain ? Just for test.
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@Pilow We tried that as well, same problem
Also tried with a VM on the same newtork, just another VLAN, and we're seeing the same thing. At first we figured it was because one of the xcp-ng's was on a remote site which is connected through an IPSEC VPN, but that wasn't the case.
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Reviving this one because it never really got a clean ending. The fix for the Body Timeout Error on full backups went into xapi-project/xen-api#6786 and shipped with the March 2026 8.3 maintenance updates.
@nikade, back in March, you mentioned still hitting it on both Linux and Windows VMs even after updating. Is that still the case for you on current versions? And anyone else who landed here: are you still seeing it, or did the update sort it out?
Mostly trying to work out whether there's still something to chase or whether we can call this resolved. I'm not deep enough in the backup internals to say for sure, so your real-world results would tell us far more than anything I could guess. Thanks!
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I need to update a few things and then I plan on trying to see if this was fixed for me. I think I only had 2 Windows machines that were a problem, and only on machines that had a larger disk and were basically empty. The counting zeros seemed to lead to a time out. Just haven't had the time to look at much of anything lately.
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@poddingue My colleage managed to workaround the issue by re-installing the lab on other hardware, I think it is now Cisco UCS-servers. It was HP ProLiant-servers before.
Maybe it was an issue with some of the NIC or firmware, im not really sure, but it works now.
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I get this error with each metadata backup run, but every time it fail on different pool. Only 1 failed pool at once.
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@Tristis-Oris Hi,
Can you upload your complete logs from one of these jobs, please? You can DM me if you prefer
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@poddingue I have asked our engineers for feedback. We have left one big VM with 1TB empty disk - and full backups are going without errors for one week.
So it seems issue is resolved.
I have to mention that during this time we have migrated to XCP-NG 8.3. and are using one of the latest XO builds.
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