A steam client beta has been released:
https://steamcommunity.com/groups/SteamClientBeta/announcements/detail/2896341257765264787
It understands how to respond if the server issues a challenge in response to
an A2S_INFO request. Importantly because of the existing filtering environment
The previous change to pad the server browser query A2S_INFO packets has
triggered some aggressive Anti-DDoS filters for some games. This change was
made to address a reflection amplification attack in the protocol. So it looks
like we will need to address the vulnerability by securing the
We've released a mandatory update for TF2. This is the Smissmas update. The new
version number is 6239334. The notes for the update can be found here:
https://www.teamfortress.com/post.php?id=78083
Thanks.
-Eric
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