tambem podes abrir a firewall do leopard, vais a system preferences > security > firewall > allow all incoming connections
ou no terminal digitar estes comandos:
sudo ipfw -q add allow tcp from any to any 1863-6901 in
sudo ipfw -q add allow tcp from any to any 1863-6901 out
sudo ipfw -q add allow udp from any to any 1863-6901 in
sudo ipfw -q add allow udp from any to any 1863-6901 out
sudo ipfw list para verificar se foram inseridas as regras
caso peça password, e inserir a password do user da sessao corrente