Are you behind a firewall? Could you check the settings of the MacOSX firewall? (systemsettings -> network or sharing, IO think)

Are you behind a router? Could you check if your port is forwarded (in need of help with that just google for "forward port <your router name>").

__________________

-> put this banner into your own signature! <-
--
Erst im Spiel lebt der Mensch.
Nur ludantaj homoj vivas.
GnuFU.net - Gnutella For Users
Draketo.de - Shortstories, Poems, Music and strange Ideas.