ios – 错误：错误域= NSURLErrorDomain代码= -1001“请求超时.”

我使用AFNetworking 2.x和以下代码片段进行网络调用：

AFhttprequestOperationManager *manager = [AFhttprequestOperationManager manager];
manager.requestserializer = [AFJSONrequestserializer serializer];
manager.responseserializer = [AFJSONResponseserializer serializer];
manager.responseserializer.acceptableContentTypes=[manager.responseserializer.acceptableContentTypes setByAddingObject:@"text/html"];

[manager POST:<URL>
   parameters:<parameters>
      success:^(AFhttprequestOperation *operation,id responSEObject) {

          NSLog(@"JSON: %@",responSEObject);
          NSError *error = nil;
          NSDictionary *JSON = [NSJSONserialization JSONObjectWithData:responSEObject options:NSJSONReadingAllowFragments error:&error];
          if (error) {
              NSLog(@"Error serializing %@",error);
          }
          NSLog(@"Dictionary %@",JSON);
          NSLog(@"success");
      }
      failure:^(AFhttprequestOperation *operation,NSError *error) {
          NSLog(@"Error: %@",error);
      }]; 
}

更新：我已经完成了退出/重新启动的iOS Simulator.app,重置的内容和设置,但没有任何工作.