well unfortunately we can't help without details. As suggested at the bottom of that page. And at very top of this page. O.o

One thing you can try in meantime however is to go LW's tools -> options -> advanced -> superreallyadvanced -> Firewall, & change both connection & listening port to one between 49152 - 65535. Go to file menu -> disconnect. A minute later return to file menu & choose connect. See if that has any effect.