combi

There are not a lot of options in the firewall configuration panel (here in french):

Actually, it seems even more simple for me.
I reactivated the stealth mode, and added Houdini in the list of programs able to receive incoming connections.
And now it runs smoothly.

Nicolas

Ok, I think I solved my problem by desactivating the stealth mode inside my firewall settings.

You should try this if you're on osx…

Cheers.

Nicolas