Using iPhone as a TCP and UDP server - open ports?

No firewall on the iPhone. However, 99% of the time, the phone will not have a publicly accessible IP. It may be on wifi behind a router, or it may be on the cellular network most probably behind a NAT pool.

Either way, you don't have access to any of those pieces of equipment, nor do your users in the cellular context (and potentially some cases of wifi usage). Think about doing this another way.

– EiTkoCaT Sep 18 '10 at 20:50 99% of the time is perhaps a bit of an overstatement. Whenever the phone is on a WiFi, devices on the same WiFi can connect to it directly of course. – Nick Sep 18 '10 at 20:53 The app is not for users in the same router, the app is an MMORPG - lot users from all over the world getting and sending pagacges to the main server.

– EiTkoCaT Sep 18 '10 at 20:57 1 Then you really shouldn't be thinking about making a networked application until you understand how networks you know, work. – jer Sep 18 '10 at 22:26 1 Once you open a socket to your server, you can freely send data back and forth until one end closes the socket. Network programming is not simple and you should have some knowledge of how networks work before you start.

– rpetrich Sep 18 '107 at 5:41.

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