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odds are that you have changed your version in some way - or your host has. Completely reinstall with no mods of any sort.
Then read through the various threads and contact me over the weekend if you have no joy. This is normally fixable unless there is a big firewall.
 
Originally posted by jacobjuhu
I have version 1.05.

And I always check the hosts version.

Not version. Modifications, have you done any modifications of any sort.

Anyway, most people can connect to me so I'd be happy to help you resolve your problem if I can.

Mowers
 
If you get that message it is usually because the other guy ( the one you are trying to join) has a router and the firewall is blocking/hiding the IP address.

Does it happen for all games you try to join? Or just one in particular (like a friends game)?