问题现象:ssh连不上,telnet 22端口没问题 ping也是通的
解决过程:
1、检查是防火墙firewalld,systemctl disable firewalld停止
2、selinux停止
3、查看了一下 /var/log/secure日志,May 13 14:41:40 localhost polkitd[839]: Unregistered Authentication Agent for unix-process:9614:146397 (system bus name :1.27, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
4、最后,通过修改/etc/sshd/sshd_config里的UseDNS no,从yes改为no,service sshd restart之后一下就连上了