I installed mod security using this tutorial http://www.linuxmaza.... . After installing I got the error described and followed the steps to solve it. The only thing I did differently was updating apache from the repo rather than uninstalling first.
Apache fails on restart, the error log tell me this :
Update: I uninstalled apache and did a clean install. Still getting the same error though.
[Mon Feb 20 16:45:24 2012] [notice] caught SIGTERM, shutting down [Mon Feb 20 16:45:35 2012] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec) [Mon Feb 20 16:45:35 2012] [alert] (EAI 2)Name or service not known: mod_unique_id: unable to find IPv4 address of "astinf" Configuration Failed