Hyper-v VM backup fails on one cluster node

[sc211166]

We opened the Case # 07887254
A windows 2-node Windows 2025 Hyper-v cluster and VBR 12.3.
When Jobs tries to backup VM that are running one "host1" they fails. The jobs starts correctly up to the VM's snapshot creation but then they simply hung doing nothing.
Simply moving the VM to the other host let the jobs complete successfully
The nodes are configured exactly the same.
Firewall has been disabled on the hosts and the external firewall, which is the gateway configured to let all the traffic from the host to pass

[david.domask]

Hi sc211166,

Thanks for sharing your case number and sorry to hear about the issues.

Please continue with Support, as we will not be able to provide meaningful troubleshooting over the forums. If you have concerns about the progress / handling of the case, use the Talk to a Manager button in the case portal to reach out to Veeam Support Management -- they will review the case, and do their best to assist with progressing the research on the issue.