What specifically are you trying to do? What operation?

Need a few more details and screenshots if you can as this is very vague to even guess what to do.

Hi, I would run test-netconnection -computername <ServerName> -Port 6160

to the server, see if that connects successfully. If that works I would take a packet capture on the destination server to confirm that the server receives the packet, and if it replies I would do a packet capture on the source to see if the packet makes a return trip.

As @Chris.Childerhose mentions...need more specific details what you’re trying to accomplish. If you’re trying to add a server to Veeam, make sure your credentials are correct, and use the correct format: DOMAIN\Username, then pwd; or LOCAL_HOST_NAME\Username, then pwd. If you do use a host not on the domain, you may need to change your registry settings to be able to have a local admin user connect to your server.

@csaha77 There are many situations to cause these issues. You can follow the link to troubleshoot it.

https://www.veeam.com/kb2065

https://www.veeam.com/kb4444?ad=in-text-link

Configuration were already set for the vsphere host but the job showed error message today. So I enter the password in managed server but that did not resolve the issue

Hi @csaha77 - can you share a screenshot of where you’re getting the error? What process are you trying to do? Add a server? Back up a VM? Agent? Etc...

We resolved this issue by changing administrator password in Backup repository. 

Ah, ok. Glad to hear you got it sorted!

Hi @coolsport00 - please I got the same error but with Target machine: X:11731] 

I'm trying to add a server (its workgroup) and the credential is right, the firewall is allowed and in some cases in troubleshooting I disabled it and the same error still appears,

kindly I would like your advise about this situation  

Did you look at the resolution the OP posted above that fixed the issue?