gistfile1.txt

    NSURL *url = [NSURL URLWithString:@"https://google.co.uk"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
    NSError *error;
    [NSURLConnection sendSynchronousRequest:request
                          returningResponse:nil
                                      error:&error];
    NSLog(@"NSURLConnection error: %@", error.localizedDescription);
    
    [[[NSURLSession sharedSession]
     dataTaskWithRequest:request
     completionHandler:^(NSData *data, NSURLResponse *res, NSError *error) {
         NSLog(@"NSURLSession error: %@", error.localizedDescription);
     }] resume];

Demonstrating a bug in iOS 8.1 & 8.2 (fixed in 8.3)
http://www.rsaunders.co.uk/2015/05/network-errors-are-unlocalised-in-ios.html