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在 Microsoft Azure 虚拟机上工作时，我注意到它明显滞后，所以我决定运行 sudo reboot 命令，然后 ssh 返回。当我尝试 ssh 返回时
ssh user@ipaddress
我得到了错误:
ssh: connect to host xxx.xx.xx.xxx port 22: Operation timed out.
当我使用 -vvv 运行 ssh 命令时，我得到:
OpenSSH_6.9p1, LibreSSL 2.1.8
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 20: Applying options for *
debug1: /etc/ssh/ssh_config line 53: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to xxx.xx.xx.xxx [xxx.xx.xx.xxx] port 22.
debug1: connect to address xxx.xx.xx.xxx port 22: Operation timed out
ssh: connect to host xxx.xx.xx.xxx port 22: Operation timed out