ssh -vvv root@IP地址 OpenSSH_5.9p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /etc/ssh_config debug1: /etc/ssh_config line 20: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to IP地址 [IP地址] port 22. debug1: connect to address IP地址 port 22: Operation timed out ssh: connect to host IP地址 port 22: Operation timed out