Error connecting to list servers is an irregular problem with three possibilities:

1. You do not have the latest list server patch (a new one was released very recently, see J2O).
2. There are no servers up or the list servers are down.
3. You have a firewall blocking you from outgoing list access.

Ensure number 1 and 2 are fixed by downloading the latest patch and verifying that the list servers are up by checking games in progress.

Number three may take some more work. The most likely cause is a software firewall. Check if you have ZoneAlarm or some other firewall running. Also check if the Windows XP firewall is enabled. If you have a firewall, you will need to configure it to allow JJ2 to access the list servers. Consult your individual documentation to do this.

If you can't find a software firewall, you either have a router that is blocking the connection, or your ISP is blocking the connection. If you have a router, see this article. If your ISP is blocking the connection, you will have to talk to them to get support.