Joomla An Error has occurred Unable to open configuration.php file to write

If you try to edit the global configuration in Joomla and receive the message

An Error has occurred! Unable to open configuration.php file to write!

On your serverset the permissions for the configuration.php in the root of the website to enable modify permissions to the Internet guest account.

You may also get an error uploading images

Warning: Failed to move file!

Error. Unable to upload file.

Set the internet guest account to have permissions on the following folders and files:

images
media
uploadfiles
components
language
modules
templates
administrator/backups
administrator/components
configuration.php