I also use an SMC router, and this is what works for me. In Special Applications, configure it like this:
That's all I use (nothing in Virtual Server), and I can both host games and join games. You may not even need the port range for Public Port - just 10052 should work as well.
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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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