JJ2 connects to ports 10052 TCP\UDP, 10053 TCP, and 10054 TCP. It hosts on port 10052 TCP\UDP.
You shouldn't need to open another range of ports, but if it works I guess it works. It might be something to do with how TCP\IP connections work - there is a source port number randomly selected on the computer making the connection. But a router\gateway should be able to handle this without additional forwarding (because it works for HTTP, etc, which also use TCP\IP).
__________________
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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