Sharepoint backups fail - The logon account that was provided does not have valid credentials
I'm backuping a Sharepoint 2010 Infra with Backup Exec 2010 R3.
Backups were running well for a while, but since 3 weeks, backups fail with error:
Final error: 0xe0009b61 - The logon account that was provided does not have valid credentials. Ensure that the user name and password are correct, and then try again.
Final error category: Security Errors
Nothing has changed in our SP farm or backup server.
When I try to browse the SP farm in the selection list, I have an "None of the Web servers for the specified server farm could be accessed" error as mentionned here: http://www.symantec.com/business/support/index?page=content&id=TECH134986
I followed the previous article without success.
Followed also related articles without success:
I checked persmissions in SP, SQL, Windows, all is fine.