If you Upgrade your Debian Webservers to the new Debian-relase “Jessie”, you might experience some issues with the config-syntax of Apache2.4.
Here are some examples of old and new ways to do the same access control:
2.2 configuration:
Order deny,allow
Deny from all
2.4 configuration:
Require all denied
2.2 configuration:
Order allow,deny
Allow from all
2.4 configuration:
Require all granted
2.2 configuration:
Order Deny,Allow
Deny from all
Allow from example.org
2.4 configuration:
Require host example.org
I really recommend to have a look at the Apache’s Upgrade Site to get an overview of the changes
