此异常表示您正在尝试连接的IP /端口上没有服务侦听：

This exception means that there is no service listening on the IP/port you are trying to connect to:

• 您正在尝试连接到错误的IP /端口。


• 您尚未启动服务器。


• 您的服务器没有监听连接。


• 在Windows服务器上，监听积压队列已满。

• You are trying to connect to the wrong IP/port.
• You have not started your server.
• Your server is not listening for connections.
• On Windows servers, the listen backlog queue is full.