On each DLO client machine, exit the DLO Agent. Using a Registry Editor, browse to :-
64-bit clients:-
Path: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Symantec\Symantec DLO\Client
Key: DefaultMediaServer
Path: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Symantec\Symantec DLO\DB
Key: DBServer
If needed, change the value of DBName / DBInstance as well.
32-bit clients:
Path: HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\Symantec DLO\Client
Key: DefaultMediaServer
Path: HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\Symantec DLO\DB
Key: DBServer
Launch the DLO Agent. If everything is fine, it should launch without any errors.
You can re-push the DLO client from the DLO server, however its recommended to uninstall the existing install and then run a push install. This will involve lot of reboots and a registry edit option will be comparatively easier.