A few people with Tiscali seem to be unable to connect recently. Tiscali are known for traffic shaping but maybe they've also started blocking ports? That's just a guess. You could try changing to a different port (eg 64049). In LW tools > options > advanced > firewall config. Here you can change LW's listening port number.
Listening port, specific ports allowed through a software firewall & any ports forwarded through a router must all be the same number

If that doesn't help, give us your details
System details - help us to help you

If this is a Tiscali problem, there might not be much we can do to help. Use the forum search to look for Tiscali...you'll find other threads with info.