1. Try telnetting to the client's bpcd port. If this fails, check that bpcd is running on the client and that point #2 below is verified.
2. If the client is behind a firewall, try opening up the bpcd (13782) and vnetd (13724) ports. Also check that these are correctly entered in the services file.
3. In the NetBackup Administration Console, expand NetBackup Management > Host Properties > Master Server > Double-click on master server > Client Attributes, verify your port and connect back options.
4. when you run bpclntcmd -pn from the client, verify if the master server's shortname or FQDN is returned. Whichever it is, make sure it is in the client's server list in the BAR GUI.