c# - 无法在 http 请求中连接到远程服务器

Question

我正在使用这篇文章来获取雅虎联系人。没关系，并给了我一个 guid。然后我http://social.yahooapis.com/v1/user/使用给定的 guid 创建一个请求。但是当我想读取来自 http 请求的响应时，我收到一条错误消息：

Unable to connect to the remote server ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 127.0.0.1:8555
   at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)

问题是什么？

Answer 1

"Actively refused it" means that the host sent a reset instead of an ack when you tried to connect. It is therefore not a problem in your code. Either there is a firewall blocking the connection or the process that is hosting the service is not listening on that port, this may be because it is not running at all or because it is listening on a different port.

once you start the process hosting your service try netstat -anb (requires admin privileges) to verify that it is running and listening on the expected port.