Admin login using relative paths

[seitenwind]

Hi, I'm managing a website that is hosted in a subdirectory ie www.myhost.net/cms, it can be accesed by a redirection from www.url.com.
I'm using these settings:

$config['root_url'] = '';
$config['root_path'] = '/is/htdocs/wpxxxxxxxx_GRAW4AWMNV/www/cms';
$config['admin_dir'] = 'admin';
$config['previews_path'] = '/is/htdocs/wpxxxxxxxx_GRAW4AWMNV/www/cms/tmp/cache';
$config['uploads_path'] = '/is/htdocs/wpxxxxxxxx_GRAW4AWMNV/www/cms/uploads';
$config['uploads_url'] = 'http://www.url.com/uploads';

So far it works fine, but when I try to enter www.url.com/admin I am redirected to www.myhost.net/admin wich should be www.myhost.net/cms/admin and even when I'm entering my data and press submit it directs me to www.myhost.net/admin/. Entering the url by hand (www.myhost.net/admin/index.php) after login in works fine.
Any ideas how to solve this?

[cyberman]

Please look at /admin/themes/default/login.php at line 12 - you will found

GetConfig(); echo $config['root_url'] . '/' . $config['admin_dir'] . '/'; ?>" />

As you can see you need only to define correct root url in config.php (cant see it in your example).

Otherwise there's maybe a fault in your redirect  ...

[seitenwind]

Maybe you are right with the redirect, because I have to leave $config['root_url'] = ''; blank, otherwise it's not working correctly...