I had some errors on a Veeam Backup and Replication 18.104.22.1681 (latest):
Backup from a dedicated backup server and the target is a physical windows machine that uses Veeam Agent 22.214.171.12484 (latest)
Error: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond %IPADRESS%:2500
Backup job is managed by Backup server.
Port 2500 is opened in both directions, and Kaspbersky Security is used and the Veeam processes are whitelisted. Have applied several fixes from the forums but the problem keeps occuring when backup is made from this specific machine only. And the first run is often faulty but when executed a second run it works without any errors.
This text is from nov 1st, i have updated the software to the latest and problem still occurs.
the NAS and the backup object are online all the time and on same subnet.