Solved! Go to Solution.
netstat -a | grep bpcd
bpcd is the daemon that listens for netbackup requests. It must be running.
telnet <client> bpcd
Check for firewall, or if netbackup itself is closing the connection.
Host Properties -> Master Servers -> right-click hambck01 and select 'Properties'
Select Firewall, click Add, enter hostname, click Add then Close. Client will be added to the bottom of the list. Select the new client, and change the attributes to match the other clients, ie:Select Connect Options tab, and in BPCD connect back, select 'VNETD port'