this are the modules of php or webservers which are known to cause problems with OwnCloud:
with entries like:
in your vhosts file.
mod_auth_apple on Mac OS X server
There is a module mod_auth_apple available on Mac OS X servers which is doing the Basic Auth like on an apache server. Disable this module.
eAccelerator PHP module
How to disable it: (Thanks to RandolfCarter for this link)
http://linuxwindowsmaster.com/how-do-i- ... celerator/
Instead of the settings like described in the linked article it is possible to disable the whole extension. Where this extension is loaded depends on the installation / system / used distro. This article describes how the extension is loaded:
https://github.com/eaccelerator/eaccele ... ccelerator
On debian this .so file is loaded in /etc/php5/conf.d/ for example.
Webserver WebDAV modules
OwnCloud brings it's own WebDAV PHP implementation (SabreDAV). Enabling the WebDAV module of your webserver can cause many problems with OwnCloud. This are the WebDAV modules of the most common webservers:
On Mountain Lion
Webserver security modules
Some webserver security modules are also known to be problematic when running on your webserver:
libapache2-mod-php5filter installed instead of libapache2-mod-php5 (php5filter don't pass all needed methods to PHP)
mod_pagespeed when having upgrade problems