SITUATION
Try this.
- (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
SecTrustRef trust = challenge.protectionSpace.serverTrust;
NSURLCredential *cred;
cred = [NSURLCredential credentialForTrust:trust];
[challenge.sender useCredential:cred forAuthenticationChallenge:challenge];
}