telnet: connect to address xx: No route to host

telnet: connect to address xx: No route to host

可以ping通
telnet: connect to address xx: No route to host
以及
mysql 连不上，navicat报错
是因为被默认的防火墙拦截了

[xx@centos7 ~] telnetcompute13306Trying192.168.126.35…telnet:connecttoaddress192.168.126.35:Noroutetohost[xx@centos7 ] telnet compute1 22
Trying 192.168.126.35…
Connected to compute1.
Escape character is ‘^]’.
SSH-2.0-OpenSSH_7.4
^C^C
Connection closed by foreign host.

2、CentOS 7 用firewall-cmd来开放端口
如：
firewall-cmd - -permanent - -add-port=3306/tcp

重新加载
firewall-cmd - -reload

确认是否开放
firewall-cmd - -list-all

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http://blog.csdn.net/zhouygjp/article/details/50592699