I am running a Minecraft server hosted at TCP 25565 which I can access via LAN, but cannot be reached externally.

I am not using any router and it is connected to an RG-Box Allied Telesis AT-iMG1525RF (my modem, which doesn't support port forwarding, all ports are opened) directly. I'm running vanilla 13w07a.

Windows Firewall is disabled as well as Avast!

I did a `netstat -a` search, and yes, I do have a connection listening at this port TCP.

Still, I get this "Connection timed out: Connect" error when trying to reach my server from anywhere outside of my network.

I called [my ISP](http://bnaa.dk) (who are fine with me having a server running and is mentioned in their terms of service) regarding this problem and they told me that they were only blocking port 24 and 25, all other ports is free to use. They also told me that I don't need to port-forward or anything, just plug my computer directly into the RG-Box, and I should be good to go. But I'm not.

It was working until three months ago. I can't change ISP as I live in an apartment where they decide my provider.