My apache logfile is getting slammed with the error message: "[error] an unknown filter was not added: PHP" I investigated the error and it appears it is caused by an incorrect way isconfig configures the virtual hosts. According to this: http://bugs.php.net/bug.php?id=22881 Looking at /etc/httpd/conf/vhosts/Vhosts_ispconfig.conf I find the cause of the problem under every vhost entry. EDIT: I removed the <Files> entries for PHP on all my vhosts in (/etc/httpd/conf/vhosts/Vhosts_ispconfig.conf), restarted apache and the error is gone. Also. the error messages are found in the main error log in /var/log not in the vhosts error log EDIT 2: I searched the forum a bit since a search for 'an unknown filter was not added: PHP' gives no results. Anybody with that error should read this thread as it tells you how to fix it the "ispconfig way" http://www.howtoforge.com/forums/showthread.php?t=15273 or the short version, fix only: http://www.howtoforge.com/forums/showpost.php?p=70534&postcount=25
