I installed the latest PunBB for testing. When I login I get redirected to an invalid HTTPS url. My test setup uses HTTP.
Environment:
Debian 6
PHP 5.4, Nginx 1.2 from DotDeb repo.
SQLite 3
After some digging I trace it to the get_current_url function in include/functions.php, specifically this line:
$protocol = (!isset($_SERVER['HTTPS']) || strtolower($_SERVER['HTTPS']) == 'off') ? ...It seems that on my system $_SERVER['HTTPS'] is set, but to an empty string.
I changed that line to:
$protocol = (!isset($_SERVER['HTTPS']) || empty($_SERVER['HTTPS']) || strtolower($_SERVER['HTTPS']) == 'off') ? ...And all is well. I login and get redirected correctly.