Not exactly sure about question, but if you're use 6.5, then the two ports you should be concerned about is:

13724 - vnetd
1556 - pbx

Use the command "netstat" on both Windows and Linux/UNIX. This will show what ports are connected.

C:\netstat -n

 Active Connections

  Proto  Local Address          Foreign Address        State
  TCP    OP54698:2570           localhost:2571         ESTABLISHED
  TCP    OP54698:2571           localhost:2570         ESTABLISHED
  TCP    OP54698:2572           localhost:2573         ESTABLISHED
  TCP    OP54698:2573           localhost:2572         ESTABLISHED

You will find the Netbackup services in there usual places.

/etc/services on UNIX
Windows\System32\drivers\etc\services

For more in depth information visit the Documentation: 

Veritas NetBackup (tm) 6.5 Administrator's Guide for Windows, Volume 1: Provides information on performing most common configuration and administration tasks with NetBackup 6.5 including: - Managing media, storage units, unit groups, catalogs and lifecycle policies - Firewall Configuration - Firewall ports used for communication

Veritas NetBackup (tm) 6.5 Security and Encryption Guide: Provides security configuration and administration information for NetBackup 6.5 administrators, including: - Security Deployment Models - Access control security - Firewall Configuration - Firewall ports used for communication - How to back up data through a firewall

Another doc: Port Usage Guide for Windows and UNIX Platforms

For windows you can even use TCPView. This is a graphical tool which lists all running processes with protocols and port numbers.

http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx

Thanks everyone....
every post helped me in some or the other way ;)