It works fine on Windows XP, so presuming that that version uses the same ports as the OS X version then it's not an issue with my router. The fault would therefore seem to lie with the Mac either with some setting on it or with the app itself. Running some network sniffing on my Mac shows it talkin...

I don't think that it's a firewall thing... I've turned off my local firewall and some of the protection on my router and I still can't authenticate. The Steam app itself and Crusader Kings 2 (the other Steam game that I have, I'm not very reluctant to buy more) are both fine. Do you happen to have ...

OS X is definitely supported, somewhat ironically if I were running the Windows version I'd probably have an easier time in ripping the thing to pieces and working out the problem... Looking into this some more it appears that I've got the same problem that someone posted about here: http://forums.i...

There's no Mac subforum so let's try this here... I've just bought Defcon for my Mac from the Steam store and it's crashing every time it launches. The game loads, gets to the spinning globe, seems to possibly be authorising and then it crashes out. Hunting around this does seem to be a common probl...