Still wondering how this client software was installed...
Extract from NBU 6.5 Installation Guide:
During installation, NetBackup does the following:
... Adds the appropriate entries to the client’s /etc/services and inetd.conf files or xinetd.d directory.
On NBU Clients up to 6.5, there were no startup scripts. vnetd and bpcd run as part of inetd and only need to be in LISTENING state.
If security dictates that entries be removed from inetd.conf, startup scripts must be put in place to start vnetd and bpcd in standalone mode:
/usr/openv/netbackup/bin/bpcd -standalone
/usr/openv/netbackup/bin/vnetd -standalone
/etc/services entries must exist with NBU port numbers.
As from NBU 7.x, these entries are no longer necessary and startup scripts are in place to start vnetd, bpcd and PBX.
So, yes - you need to upgrade.
In the meantime, you can try to run above 2 commands.