Netbackup Error code 58

Best possible troubleshooting tool for status 58 is NBU bptestbpcd command.

It test port connectivity as well as forward and reverse name lookup.

Please do the following:

Create bpcd log folder on client under netbackup/logs.

Next, test from master as well as all media servers that can backup this client:

bptestbpcd -client <client-name> -verbose -debug

Output of command will prove port connectivity to client as well as forward name lookup.

bpcd log file on client will show client's attempt to resolve server's IP address to hostname, followed by comparison of resolved hostname with SERVER entries.
Next, bpcd log will show attempt back to server on either vnetd (13724) or PBX (1556), depending on NBU version.