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Hello, I have a Hyper-V host with 2012 R2 on it and already added to Veeam as a host and it was working fine. One day I found a VM backup job fail. Hello. I have the same problem. I have Windows Hyper-V Server 2016. Updates were installed yesterday and I think the problem is in KB5014702
I have error in eventlog DCOM 10036 "The server-side authentication level policy does not allow the user %1\%2 SID (%3) from address %4 to activate DCOM server. Please raise the activation authentication level at least to RPC_C_AUTHN_LEVEL_PKT_INTEGRITY in client application." Reason and solution: https://support.microsoft.com/en-us/topic/kb5004442-manage-changes-for-windows-dcom-server-security-feature-bypass-cve-2021-26414-f1400b52-c141-43d2-941e-37ed901c769c You can also see: https://forums.veeam.com/veeam-agent-for-windows-f33/dcom-hardening-on-windows-server-june-cu-t81317.html
DWORD: RequireIntegrityActivationAuthenticationLevel = 0 on Hyper-V host and restart this
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