pfSense

1. Login and go to the captive portal status page (URL: http://your-pfsense-box.org/status_captiveportal.php)
2. Wait for your session to expire
3. Reload the page (URL: http://your-pfsense-box.org/status_captiveportal.php) and you´ll see the login form
4. Login and you´ll be redirected to the main page (URL: http://your-pfsense-box.org)

Fix:

In the file authgui.inc in /etc/inc add this $page = basename($_SERVER["SCRIPT_FILENAME"]); line after include("priv.inc");

Now you´ll stay on the page on which you logged in :)