Open case 02060405. I searched and found this happening for others here:
We have a Linux VM to which is attached a snapshot for another server. This is connected via a private network for iSCSI. We are trying to do a files to tape backup, not a VM backup.
When Veeam attempts to backup this server, it connects to the other interface which is on the server network common to Veeam and this VM. The agent gets pushed and is running. However, Veeam tries to connect to the agent on the other ip address on the private iSCSI lan and of course fails.
I checked the hosts file on the Linux machine and neither ip was listed. I added the 'public' ip address there, which did not help.
I added the server ip address to the hosts file on the B&R server, which also did not help.
Error in the job log is "Failed to connect to agent's endpoint 'ip.ad.dr.ess'. Host: 'host.name'."
I suppose I could add that network on a secondary interface on the Veeam server. But... why?