One computer can connect to Minecraft server, another can't

[CHCRANE]

So computer A(brother) has hosted a minecraft server. Computer B(Me) can connect to it from the outside world. Computer C(Friend) can not connect to it, Also outside world. Computer B is 45 min away where computer C is a 45 sec walk down the rode, same ISP. Any help? We all would greatly appreciate it. Also so same thing is happening with a Teamspeak server, Computer A host, B able to connect, C still nothing.

Note: computer C can get on other Minecraft servers and other Teamspeak servers.
Thanks alot

 

[wrt54gs7]

If computer C can connect to other severs then most likely the problem lies in computer A. Check firewall rules, try disabling computer A's firewall.