Did the restore job show up in Activity Monitor?
If so, please show us all text in Details tab.
If not, double-check that redirected restore is allowed.
Verify that Windows Explorer did not add .txt to No.Restrictions file.
Check that Client Read Timeout on media server is increased to give SQL time to initialize databases before actual restore can be started. Set it to 3 hours (10800) to prevent timeouts.
Next, ensure that logging is enabled. Create the following log folders under ...\netbackup\logs:
On master: bprd
(Restart NBU Request Service to enable this log)
On destination SQL client: dbclient
After next failure, please copy logs to .txt files (e.g. bprd.txt) and upload as File attachments.