Is it possible to use ProtoProxy with more than one player?
Can it handle more than one Connection?
No but you could spin up multiple instances.
Sorry for the late answer, I'm on a train.
One ProtoProxy can service only one connection at a time. But you can start several instances of ProtoProxy, each listening on a different port, and each accepting one player.
Hmm, too late.
Okay, thanks.
Why can ProtoProxy only service one connection?
For simplicity. Why service more connections, when 99.99% one is all you need, and that 0.001% can be worked around by starting two instances. Servicing multiple connections would make it unreasonably complicated.