Firewall rules - blocking tomcat traffic inadvertantly?

[jon yeargers <jo...@lupinesystems.net>]

I have a tomcat server in a DMZ coming off my firewall machine. I have
permitted traffic to /from port 8080 but am having some connection
problems. Are there other *standard* ports needed for communications
with my server process? 
 
Specifically Im trying to call URLConnection::getOutputStream() - AFAIK
it doesn't ask for a specific port # so I don't think Im doing anything
entirely strange with it. Communication with my server process works ok
when its not across the firewall but fails otherwise (I can get info
from the server but I can't send files back).