Type "telnet mousemessenger.badlion.net 4100" without the quotes and hit enter
Results:
If you see a similar page, then the connection is fine and can reach to our servers
If you see a similar page, then the connection is blocked and cannot reach to our servers
If you get a message that Telnet is not recognized as an internal or external command, operable program or batch file, you have to follow this guide first.