So you tried the other ports also. Hmm ...
I wonder ... how about trying another gnutella program & seeing if you fare better? Phex:
http://www.gnutellaforums.com/showthread.php?t=55271
Or FrostWire:
http://www.frostwire.com/index.php?title=Main_Page
Or BearShare Lite:
http://www.filehippo.com/download_bearshare_lite/ (though you might want to check out version 5.1 & not 5.2)