Hi artk1,
Brian is correct, assuming that you are using the default clu-prod distribution center of the LUA 2.x server.
Another option is to have the content that was downloaded by the LUA 2.x server distributed to any file server, webserver etc in your environment. The SEP clients could be configured to retrieve their new defs from there using port 21, 80 etc that may already be open.
Hope this helps!
Mick