CentOS 7.3非root用户执行git clone时卡在正克隆到'XXXXXX'
$ git clone git@github.com:XXX/XXXXXX.git
正克隆到 'XXXXXX'...
ssh: connect to host github.com port 22: Connection timed out
fatal: Could not read from remote repository.
Please make sure you have the correct access rights and the repository exists.
错误：到github.com:22连接超时
原因：用22端口无法使
解决方法：
CentOS 7.3非root用户配置ssh免密码登陆 CentOS 7.3执行git clone时卡在正克隆到'XXXXXX'