Oryginalnie napisane przez Tibia.com FAQ

To play Tibia you need a fully functional direct TCP/IP-connection to the game servers. If you encounter problems while connecting to the game servers, please check your network preferences or ask your system administrator for advice. Please note that some internet providers restrict the functionality of internet accesses, i.e. they allow only certain programs (usually browsers) to pass through, while others such as the client are denied access to the internet. It is also possible that a connection to the game servers is prevented by a proxy or by a firewall that protects your computer. Please make sure that connections to port 7171 of the game servers are allowed. Also, if you have recently logged into the test server, it is possible that the "Test Server Login" is still enabled in your client's network options. Remove the tick at the corresponding option in order to allow access to the regular game servers.