Symantec Management Platform (Notification Server)

I have SMP7.1 and am trying to set up a Site Server in a remote office.  All computers that I installed the client on in my test run a few weeks ago show as potential site servers.  Of my more recent deployments no computers show as options.  Is there a specific plugin that is needed for a system to be a site server?  I have set them up to match the other systems that can be site servers and still not an option.

It should not be a software compatibility issue as the machine I was able to set up as a site server is 2003 with DS6.9 and the system I want as the actual site server is the same.  I only mention the 6.9 because I thought it might cause a conflict, then I realized the functional system has 6.9.

any ideas?

If I understand correctly, you're going to Settings > Notification Server > Site Settings, then New > Site Server, and systems that have the Symantec Management Agent installed are not listed here?

Correct.  Some systems are there but not all.  Of course the one I need as the Site Server is not there.  The Management Agent is installed and appears to be reporting correctly.

FYI it was because ports had been blocked between the local site and the site that houses the SMP/NS  I used the Ports and Protocols guide to get the right ports unblocked.  Someone had blocked the ports between the initial setup and installing the client on the computer that was to be the site service.

http://www.symantec.com/business/support/index?page=content&id=DOC1892