Salut, that's weird. You do not seem firewalled. You can upgrade to java 1.5,
http://java.sun.com/j2se/1.5.0/download.jsp (take the JRE). Also I would disable UP mode to test uploads as you are less likely to be searched (less uploads) running as UP -options-speed -desactivate UP mode. I also see that you share 3089 files which is on the high side. The way Gnutella works, it is bad to share too much files because of the Query Routing Proposal (QRP) system. Once you have a QRP over 60% the routing efficiency drops a lot meaning that you receive all searches instead of searches for the files you share. Try to lower that amount to around 1000, keeping only rarer files or files you want to keep spreading.
Bonne chance