Oui c'est la mise à jour de Steam et en effet Allgo doit être modifié pour pouvoir fonctionner(d'ou mon topic car au début, j'avais un doute d'ou pouvait venir le problème).
Connect-Problems with latest Steam Update 08/04/2004 11:15
Since valve updated their Steam system this morning it is no longer possible to connect to Steam servers via HLSW. It appears only the Steam menu. After frist enquiries are also other game server browsers affected. Obvious it is a bug in the new Steam version.
At the moment we know no workaround for this problem. You can complain at Steam forum to point out this problem ...
Update:
There are 2 small workarounds available now:
1.
Check your hlsw settings for Half-Life (Important: not Half-Life Steam!) and enter "-applaunch 10" at "Additional parameters"
(Only works for Counter-strike)
2.
Download the following file und copy it into your steam-directory.
Now set this exe as your steam-start-executable instead of steam.exe in your hlsw-settings.
Source :
http://www.hlsw.org/?language=English