The IPFire project creates a distribution for use on firewalls. The distribution uses a web-based interface for administration which is powered by the Apache web server. The latest IPFire update bumps the Apache service from version 2.2 to 2.4 which may have side-effects. "For all users that have installed own Virtual Hosts in Apache, the web user interface won't restart after the update. Please update the configuration files to the new configuration file format of Apache 2.4 and then restart the system. All IPFire add-ons will of course be automatically migrated." Additional information on the upgrade can be found on the project's news page.