the proplem seems to be in communication.  if both of the physical nodes work fine in backup then you should have the virtual node work. unless there is proplem in DNS and reserver lookup , I advice you to update the virula node IP in hosts files of both physical NODES and stop nsrexec on both , rename  the tmp folders then try tha backup again

We plan to upgrade the client version then take it from there...

Hi,

you must create the file  extension pathownerignore without on each cluster node.

Hi,

you must create the file pathownerignore without extension on each cluster node on the path in the folder bin of networker.