问题解决步骤：
1、参考http://jingyan.baidu.com/article/95c9d20dac9040ec4f75617a.html，发现是防火墙未关闭；
2、关闭并禁止firewall开机启动：
停止：
systemctl stop firewalld.service
禁止开机启动：
systemctl disable firewalld.service
navicat连接centos7上mysql：2003-Can't connect to MySQL server (10060)
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