It seems that this post should rather be in the general NetBackup forum and not in the Appliance forum, right?
I have no 1st-hand experience with Live Update, and cannot find any specific port requirements.
The manual merely lists the following:
Before you can use NetBackup LiveUpdate, you must set up and configure your
NetBackup LiveUpdate server. This server can be either a Web server or a shared
disk. The only requirement is that it must be accessible by all of the NetBackup
hosts that you want to update.
Note: Currently, using a Windows shared disk requires the share to be set up as
a null share. For more details, refer to the following Technote at
Probably a good idea to go carefully through the LiveUpdate manual to see if anything was missed.
Good luck!