I had the exact same problem yesterday for the first time (using Veeam 9, freshly updated from
. I did a host vMotion of the failing VM to other host and it solved the problem. What is interesting is that not all VMs running on the problematic ESXi failed the backup, only few of them.. Anyway I did fully reboot the host and I will see tomorrow if the problem is still there.
Anyway thanks for the posts in this thread, it helps me debug the problem quickly !