错误：错误域= NSURLErrorDomain代码= -1001“请求超时。”

我正在使用Xcode 6.1，iOS 8.1中的应用程序;该应用程序工作完全正常，直到2天，但今天，当我执行它时，我在网络服务&错误打印在下面。

I am working on an application in Xcode 6.1, iOS 8.1; the application was working completely fine till 2 days before, but today as I executed it I got an error in the web service & the error is printed below.

错误：错误域= NSURLErrorDomain代码= -1001请求时间为
out。 UserInfo = 0x7c6899b0 {NSErrorFailingURLStringKey =，
NSErrorFailingURLKey =，NSLocalizedDescription =请求时间
out。，NSUnderlyingError = 0x7c688f60请求超时。}

Error: Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo=0x7c6899b0 {NSErrorFailingURLStringKey=, NSErrorFailingURLKey=, NSLocalizedDescription=The request timed out., NSUnderlyingError=0x7c688f60 "The request timed out."}

我曾使用AFNetworking 2.x和以下代码片段进行网络通话：

I had used AFNetworking 2.x and following code snippet to make network call:

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：我已经退出/重新启动了iOS Simulator.app，重置内容&设置，但没有任何效果。

UPDATE: I had done quit/relaunched the iOS Simulator.app, reseted content & settings, but nothing worked.