Hi.
By setting a keyword for Admin Panel with Maitenance Mode "ON" and upon logout, getting this error:

Notice: Use of undefined constant HTTPS_CATALOG - assumed 'HTTPS_CATALOG' in /home/myhost/public_html/system/library/user.php on line 60

I tried to add the constant to root folder's define.php:

define('HTTPS_CATALOG',(!empty($_SERVER['HTTPS']) ? 'https://' : 'http://') . $_SERVER['HTTP_HOST'] . rtrim(dirname($_SERVER['SCRIPT_NAME']), '/.\\') . '/');

But browser returns "too many redirects" error.

Any tip?