安装好dashboard 登陆出现错误

验证发生错误。请稍后再试一次。

While turning SELinux off certainly does the trick, it is somewhat like using a sledgehammer to break a nut. The similar problem was solved for me with by allowing apache to initiate network connections itself, without disabling SELinux completely:

setsebool -P httpd_can_network_connect 1