Hi There John,
How far are you getting? Is LUA able to successfully download and distribute the SAVFL definitions? If there is a failure, you will see it in the LUA Event Log.
If so, then the problem is likely with the SAVFL clients: LiveUpdate on the Linux machines.
Are some SAVFL clients able to successfully connect to that Distribution Center and retrieve the latest definitions? Or are all failing to do so?
The log on each individual SAVFL client is called liveupdt.log - the location is configurable, but it is generally in /opt/Symantec/LiveUpdate/liveupdt.log
This article may help:
Configuring Symantec Antivirus for Linux (SAVFL) to download definitions from the Distribution Center of an internal LiveUpdate Administrator (LUA) 2.x Server
Article URL http://www.symantec.com/docs/TECH93505