I have several Hyper-V hosts in different domains that have same name. When I try to add hosts from domains different Veeam One host domain, I get error:
"Veeam ONE Monitor could not connect to "hyperv1.example.com". A security package specific error occured (Exception from HRESULT: 0x80070721)"
Windows Event Log shows Security-Kerberos error:
(The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server hyperv1$. The target name used was host/hyperv1.example.com. This indicates that the target server failed to decrypt the ticket provided by the client. This can occur when the target server principal name (SPN) is registered on an account other than the account the target service is using. Ensure that the target SPN is only registered on the account used by the server. This error can also happen if the target service account password is different than what is configured on the Kerberos Key Distribution Center for that target service. Ensure that the service on the server and the KDC are both configured to use the same password. If the server name is not fully qualified, and the target domain (CONTOSO.COM) is different from the client domain (EXAMPLE.COM), check if there are identically named server accounts in these two domains, or use the fully-qualified name to identify the server.)
If Hyper-V host have name that doesn't exist in Veeam ONE machine domain - host adds without any problem.
If I input IP instead DNS name I can add any host from any domain.