The mentioned veeam services does not start, have restarted the backup server as well.

We might need more information on this.

What Veeam version are you running? What happened, that the services stopped? What OS version are you on? What does the Windows logs say?

If this is critical, I recommend opening a Veeam support ticket asap to get this investigated quickly. From the community, we cannot provide support like our Veeam team can.

Best

Lukas

  <04>   Error (3)    [MSSQL] Unable to connect to SQL Server . A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Veeam.Backup.DBCreator.DatabaseException)

This is the error i see from the svc.veeambackup.log, while we are checking with DB team, what checks has to be done from backup server end ? the SQL is hosted on remote server.

Veeam version is 12.

Most of the services that are stopped depend on the VeeamBackupSVC service to start so that is where you need to focus.  More information like Lukas said and checking the Event Viewer is a good start.  Once you get this service running, then the others will start fine.

In this case I’d strongly recommend to reach out to Veeam support. I have seen some strange things on SQL config DBs in the past, so I stopped toiuching them myself because they can be sketchy.

As mentioned by the others ​@Bennet , I recommend getting ahold of Veeam Support. If you’re really needing to get back up and going, the only other thing you could do while awaiting Support is to do a Confifg DB Restore operation if you wanted. Once Restored, your other services should start as Chris mentions.