Here's an image that will help explain what is happening:
Basically you have something that is letting you make an outgoing connection, but is blocking the incoming connection from the JJ2 server. What this is I don't know. You said you don't have a firewall - are you sure? Are you in a home network of any kind?
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With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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