Cannot save Global Configuration changes

From Joomla! Documentation

Should this be in the FAQ page?

One Fix for this problem (at least)

Having struggled with this problem for 2 days, I was very surprised to find that there is a simple solution.

The answer appears to be to add this line to the .htaccess file in the root directory of the specific Joomla installation:

"Here's what works for me. I'm using Joomla 1.5.3, SEF: on, Apache mod_rewrite; on. Just add this line to your .htaccess."

SecFilterEngine Off

The author of this fix is to be found here:

Just don't forget to comment out this line after changing one's site configuration ...

hope that this helps others. John K

Note on systems with SELinux

When dealing with SELinux we need to update context of the /var/www/html/sites/ to read and write:
# chcon -R -t httpd_sys_content_rw_t /var/www/html/sites/

To check a SELinux context use ls command with -Z option. Example:
# ls -Z settings.php -r--r--r--. apache apache unconfined_u:object_r:httpd_sys_rw_content_t:s0 settings.php
For files copied from ~/ you may have wrong context as:
# ls -Z default.settings.php -rw-r--r--. 6226 6226 unconfined_u:object_r:user_home_t:s0 default.settings.php