Thanks for your replies. I see that this work for FP2 too. The method is actually very simple. If anybody wants to start own "Nokia WLAN Connectivity Test server":

1. You need web server with dedicated public IP and access to default page. (shared hosting with many-sites-on-one-IP will not work because the query goes to IP, without reference to host-name, and so has to be worked out by 'default site')
2. Place the following PHP code (or rewrite it in other server-side language) in your index file:

Code:

$headers = apache_request_headers();

if(isset($headers['X-Nokia-WLAN-Connectivity-Test']))
{
    header('X-Nokia-WLAN-Connectivity-Test', 'true');
    exit();
}

3. Change hosts file on your device (C:\Private\10000882\hosts for S^3) like

Code:

_YOUR_SERVER_IP_    connectivity-test.ext.nokia.com

4. You're done!