What are your ZoneAlarm settings for JJ2?
This looks more like it could be a problem client-side. If the firewall is blocking JJ2 ports, then nobody will get through, and if it is not (or it is not running), then everyone is able to get through.
However, make sure you don't have any other firewalls (hardware or software), and make sure that ZoneAlarm is either set to allow full access (in and out) for JJ2, or set to allow incoming and outgoing packets on TCP ports 10052, 10053, 10054, and UDP ports 10052.
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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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