“Connection refused” vs “No route to host” Home » 编程开发 » “Connection refused” vs “No route to host” ): Trying172.1.2.1… telnet: connect to address172.1.2.1: Connection refused 结论:说明No route to host是防火墙的返回,,先经过防火墙,不管端口有没有。然后如果通过了防火墙,但监听未启动,则提示Connection refused的错误。 当你能飞的时候就不要放弃飞