The resource could not be loaded because the Application Transport Security policy requires a secure connection

Having trouble updating Xcode to 7.0 or iOS 9.0. Somehow it started giving me the title error

"The resource could not be loaded because the application transport security policy requires the use of a secure connection"

Web service method:

-(void)ServiceCall:(NSString*)ServiceName :(NSString *)DataString
{
NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
    [sessionConfiguration setAllowsCellularAccess:YES];
    [sessionConfiguration setHTTPAdditionalHeaders:@{ @"Accept" : @"application/json" }];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration];

    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@",ServiceURL]];
    NSLog(@"URl %@%@",url,DataString);
    // Configure the Request
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setValue:[NSString stringWithFormat:@"%@=%@", strSessName, strSessVal] forHTTPHeaderField:@"Cookie"];
    request.HTTPBody = [DataString dataUsingEncoding:NSUTF8StringEncoding];
    request.HTTPMethod = @"Post";

    // post the request and handle response
    NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
                                          {
                                              // Handle the Response
                                              if(error)
                                              {
                                                  NSLog(@"%@",[NSString stringWithFormat:@"Connection failed: %@", [error description]]);

                                                  // Update the View
                                                  dispatch_async(dispatch_get_main_queue(), ^{

                                                      // Hide the Loader
                                                      [MBProgressHUD hideHUDForView:[[UIApplication sharedApplication] delegate].window animated:YES];


                                                  });
                                                  return;
                                              }
                                              NSArray * cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:request.URL];
                                              for (NSHTTPCookie * cookie in cookies)
                                              {
                                                  NSLog(@"%@=%@", cookie.name, cookie.value);
                                                  strSessName=cookie.name;
                                                  strSessVal=cookie.value;

                                              }

                                              NSString *retVal = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}];
[postDataTask resume];

}

The service was working fine for Xcode earlier versions and iOS earlier versions, but when I updated to Xcode 7.0 on iOS 9.0, it started to have issues like below when I call the above web service method. The logging error I get is:

Connection failed: Error Domain=NSURLErrorDomain Code=-1022 "The resource could not be loaded because the application transport security policy requires the use of a secure connection." UserInfo={NSUnderlyingError=0x7fada0f31880{Error Domain=kCFErrorDomainCFNetwork Code=-1022"(null)"}, NSErrorFailingURLStringKey= MyServiceURL , NSErrorFailingURLKey= MyServiceURL , NSLocalizedDescription=The resource could not be loaded because the application transport security policy requires the use of a secure security connection. }

I have tried the following questions and answers but got no results, are there any advanced ideas to remove this service call error?

1. ios9 can't load resource
2. App Transport Security Xcode 7 Beta 6
3. https://stackoverflow.com/a/32609970