(iphone) reachability test for specific ip/port?

Question

I\'ve looked at Reachability sample from apple and another sample from \"Iphone developer\'s cook book\"

Here are steps to test ip/port reachability

Answer 1

To answer your question based on the comments above, according to the SCNetworkReachability Reference

A remote host is considered reachable when a data packet, sent by an application into the network stack, can leave the local device. Reachability does not guarantee that the data packet will actually be received by the host.

This will not be able to check the status of your server but just make sure it can get a data packet out.

Apple wants for your app to elegantly fail if there are any network related issue, checking to see if internet is available using Reachability is the first step. If Reachability fails you can assume that you wont be able a server and alert the user immediately. The next steps are to properly handle errors returned by your server such as a 400 bad request, 404 file not found, setting a reasonable timeout, and not blocking the UI during long downloads while showing some sort of status indicator.