I have been using following code
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]initWithRequest:request];
operation.allowsInvalidSSLCertifica
As far as I know. It's an iOS 7 issue. Apple does not allow communication with self signed certificate websites. Unless you send the certificate to device and add as a trusted certificate list.
Supporting comment on other question: https://stackoverflow.com/a/20251011/753603
Couldn't find piece of documented text by Apple.