I just installed Magento 2 on HostGator with Linux+Cpanel.
Everything seems to work fine, however, any change I do on the Configuration it keeps loading and loading and never applies.
I checked the server logs and it shows:
[Thu Mar 03 11:40:43 2016] [error] [client 126.96.36.199] client denied by server configuration: /home3/e9u3j7z1/public_html/magento/app/etc/config.php
The file has 644 permission, because it is required by Cpanel, I tried to change it to 755, 777, 775 but it doesn't solve the problem.
Someone could help?
The "client denied by server configuration" is the right web server answer on a Magento 2 security check.
The message is not related to your problem.
See how to diagnose Magento 2 errors: https://mage2.pro/t/307