iPhone and ASIHTTPRequest - Unable to start HTTP connection

I am using the ASIHTTPRequest class in order to communicate with a web service and get a response. This is how I send a request to the server ``` NSString *str = [NSString stringWithFormat:@"%@verifyLogin.json", serverUrl]; NSURL *url = [NSURL URLWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; ASIHTTPRequest *request = [[[ASIHTTPRequest alloc] initWithURL:url] autorelease]; [request addRequestHeader:@"Content-Type" value:@"text/x-gwt-rpc; charset=utf-8"]; NSDictionary* data = [NSDictionary dictionaryWithObjectsAndKeys:emailId, @"username", pwd, @"password", nil]; [request appendPostData: [[data JSONFragment] dataUsingEncoding: NSUTF8StringEncoding]]; [request setRequestMethod:@"POST"]; [request setDelegate:self]; [request setDidFinishSelector: @selector(gotLoginResponse:)]; [request setDidFailSelector: @selector(loginRequestFailed:)]; [networkQueue addOperation: request]; [networkQueue go]; ``` The control immediately goes to the error routine and the error description and domain are Unable to start HTTP connection and ASIHTTPRequestErrorDomain I can get the same request to work via a desktop tool for checking HTTP requests so I know the settings are all correct. Can someone please tell me what I am missing here while sending the request? Thanks.