Recently I’ve upgraded to the apache 2.4.6 on my machine. After that the sites weren’t working anymore and the a2ensite/a2disste stopped working. Also I’ve received this error message in the log:
[core:notice] AH00094: Command line: ‘/usr/sbin/apache2’
The solution is pretty easy. Make sure your site configurations in sites-available end with .conf. If they do, enable them again and reload apache. This will solve your problems.