Bill is dead right about rebooting your modem/router - definatley worth trying.

Another thing to check that I come across all the time, is a third party firewall is installed. You may have inadvertently given it the wrong answer when it asked about allowing the new outgoing connection when installing XaraXtreme.

If this is the case, you will need to find and edit the rule. This will depend on which firewall software you might be using.

Hopefully Bills suggestion will be the winner