1.
OSX Firewall settings for Tiger; not that you really need a firewall for mac.
5-6.
http://www.gnutellaforums.com/showth...threadid=52014 this is the vital step at my guess. As your port 6346 is blocked. You need to either enable UPnP (NAT-PMP) or forward a port.
13. Is due to the presence of an unconfigured firewall ... probably the airport being the issue.