Thread revival, I just hit the same issue for a specific scenario, about a cross-domain replication.
Both environments have the proper firewalling, DNS conditional forwarding set, etc.
I have a VBR server in domain 1, named domain1.local, I want to replicate VMs in cluster.domain2.local. When I add the cluster configuration in veeam, it recognize the cluster and resolves it, but when on the next page it wants to deploy the agents, it does not resolve each hosts because it does not use the FQDN, just the short hostname which goes nowhere.
I was able to mitigate this temporarily by adding the servers in the domain1.local DNS server zone, and it works perfectly now, but I feel dirty by doing this.
Is there a reason why Veeam does not use FQDN across all cluster objects/nodes when it's set to use it when you specifically use it when adding the cluster in the first place?
VMCE 9 Certified - Systems Administrator