Ensure the z/OS® Media server is running and listening on the appropriate port address. If the z/OS Media server is listening on the intended port address and the authentication is configured properly, there could a problem with the z/OS Media server version that requires the library path be taken offline.
The library path is offline.
Determine the service level the z/OS Media server. Check the current README for the installed TSM Server by searching for z/OS Media server prerequisite specifications.