Wireless Printer problem

I have setup a wireless printer server using Linksys WPSM54G and it works fine on my XP machine. I have a Vista machine running Live OneCare and the firewall is blocking connection to it. I need to find the TCP port for the server to unblock traffic. Anyone have any idea which port it is? I've looked all over the net and the Linksys site is useless. I've already disabled the firewall and verified it is the problem. I want to keep it up and running as I paid for it. Any help would be appreciated.