In this case, please first check your internet connection. If you are not able to solve the problem with your connection, ask your LAN administrator or your Internet provider’s support service representative.
To connect to the server you need to establish a TCP connection at one of their server’s addresses.
To find out the server’s addresses, please, go to Settings, followed by Terminal, and open Network tab. Upper list contains the Real server’s addresses, and lower list contains the Demo server’s addresses.
If all the servers are marked as active, you can deactivate some of them, removing ticks from the tick boxes and try to reconnect. If after these steps you could not establish a connection, contact your ISP support representative.