"Operation couldn't be completed. Connection reset by peer." with NSURLConnection on iOS

Question

Hello. I'm struggling sending POST data to a server and receiving the correct response. I started by using setHTTPBody but moved to setHTTPBodyStream when I wasn't getting the correct server response for certain POST data and I read setHTTPBody has a memory leak on earlier iOS versions. The problem is setHTTPBodyStream causes the error - "Operation couldn't be completed. Connection reset by peer".

Here's the code:

NSMutableURLRequest * request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"secret but correct url goes here"] cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:10.0];
        [request setHTTPMethod: @"POST"];
        [request setHTTPBodyStream: [NSInputStream inputStreamWithData: [[NSString stringWithFormat:@"username=%@&password=%@&score=%i",[(NSString*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,  (CFStringRef)ogl_view->username, NULL,  CFSTR("?=&+"), kCFStringEncodingUTF8) autorelease],[(NSString*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,  (CFStringRef)text_field.text, NULL,  CFSTR("?=&+"), kCFStringEncodingUTF8) autorelease],ogl_view->score[0]] dataUsingEncoding:NSUnicodeStringEncoding]]];
        NSURLConnection * connection = [[NSURLConnection alloc] initWithRequest: request delegate:self];
        if (connection){
            received_data = [[NSMutableData data] retain];
            ogl_view->section = CURLING_PROCESS_CREDENTIALS;
        }else{
            ogl_view->section = CURLING_LOGIN_OR_REGISTER;
            UIAlertView *connection_alert = [[UIAlertView alloc] initWithTitle:@"Error" message: @"Can't connect to server" delegate:self cancelButtonTitle:@"Close" otherButtonTitles: nil];
            [connection_alert show];
            [connection_alert release];
        }

I can verify the server is fine and it works when I try a web-browser.

Can somebody get me on the right track to sending data with HTTP and the POST method correctly?

Thank you for any help.