How to set time-out Suse Firewall

Hi to everyone, Is it possible to set time-out on inactivity with Suse Firewall??? I uses Suse 8.2 with suse firewall and I would like that if a http connection does nothing for 15 minutes than this connection to be "lost". How can I make this? Can I make this from the firewall or I have to say to the webserver? I would like to do this from the firewall also on other protocols ftp, ssh.. etc. Thnx. Andy.