TF2 dedicated LAN server not found in game’s server browser

I’m running a dedicated Team Fortress 2 server on my LAN to which I can connect through my TF2 client’s console. However, it does not show in my TF2 client’s server browser. When I go to Servers > LAN, it just says “There are no servers running on your local network.”

What could be the problem and how do I solve it?

Found the solution: In /home/tf2server/hlds/gameserver/orangebox, put a file called steam_appid.txt whose sole contents are

440

Source: http://forums.srcds.com/viewtopic/18494

This also fixes « Loadout unavailable on dedicated TF2 LAN server ».

UPDATE: Found out there there are a couple more reasons why this can happen.

1. On the machine where you are running the Steam server, you also have the Steam client installed. Solution: Uninstall the Steam client. (Source: http://forums.srcds.com/viewpost/21999/118725#pid118725)
2. When you start the Steam server, you are specifying an IP address. Solution: Leave out the +ip parameter. (Source: http://webcache.googleusercontent.com/search?q=cache:oxKNEJJ8JvYJ:www.fusionnetwork.us/index.php/articles/general-tutorials/steam-fix-lan-server-not-showing-up-in-lan-server-browser/+&cd=4&hl=en&ct=clnk&gl=us&client=safari)