[Tutorial] How to play on Black-seraph.com (formerly coldbird.net)

[Bigpet]

The only port PPSSPP specifies is 27312, games however can use whichever ports they want, so each game can select its own ports which is why we can't give you specific ports to open.

There has been some discussion of maybe enabling tunneling through one port but that would of course break compatibility with normal PSPs