Even since I made the switch to mac from pc (about 3 years ago), I've always had problems transferring files. Sometimes I would only be able to accept files and sometimes I can't send or receive. Now, I've just installed MSN Messenger 4.0 on Panther and I'm having problems still. When I try to send, I get this message "We could not send this file because the connection is blocked. Please contact your network administrator or Internet service provider; they may be able to enable file transfers." How do you "unblock the connection"? Can somebody please help me out. Thanks.