Confused

[trevius]

This is definitely a port issue. To rule out your router, try setting it as a DMZ. If people can then connect, then your router settings are incorrect. If they still can't connect, then you have something on your PC that is blocking the connections, like a firewall.

If you do try the DMZ setting, make sure to disable it again after you are done testing. You don't want to leave it on indefinitely for security reasons. Make sure your router is set to use Port RANGE Forwarding for the ports and not Port Triggering or Port Forwarding.