Confirm Name resolution.
1. Run the nslookup command on the NetWorker server to confirm DNS resolution for the NetWorker Storage Node.
nslookup storage_node_name
This error has other potential causes. If DNS/name resolution is not an issue, see: Troubleshooting No Matching Devices or Media Waiting Errors: https://www.dell.com/support/kbdoc/en-ca/000173177/