Hi all. I've just updated one of my ISPConfig installations from 220.127.116.11 to 18.104.22.168. The process went smooth, but when I tried to access the control panel all I got was the error "403 Forbidden - You don’t have permission to access / on this server". The /var/log/apache2/error.log showed the message "[error] client denied by server configuration: /etc/apache2/htdocs", so I went to review the control panel files and found in /etc/apache2/sites-enabled/ispconfig.vhost that the <IfModule mod_php5.c> block was commented out. I am using libmodphp5, so I needed that configuration. I uncommented the block, restarted Apache2 and then I got a blank page. The /var/log/apache2/error.log showed another message: "[error] PHP Fatal error: require_once(): Failed opening required '../lib/config.inc.php' (include_path='.:/usr/share/php:/usr/share/pear') in /usr/local/ispconfig/interface/web/index.php on line 31". When I looked at that file, I found that the permissions were 700, while those of a backup file were 750. The new file and the backup were identical expect for the version number. I corrected the permissions and then I was able to access the control panel again. Hope this info helps. Best regards.