The vanilla Minecraft Server (SMP) experience on Windows without the hassle
Edit: I made a vanilla server, and the port forwarding won't work for it either, with the same error as above.
Please see this question: http://yams.in/qa/?qa=1/my-friend-cant-join-the-server&show=2#a2
It is possible that the firware on your router has been updated or the settings reset.
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