Steven Hartland wrote:
> That's not the spec, if its responding it shouldn't as that opens up the
> server to being the source of a DoDS attack, which is why the challenge
> was introduced in the first place.

From
http://developer.valvesoftware.com/wiki/Source_Server_Query_Protocol

"
Request format

Challenge values are required for A2S_PLAYER and A2S_RULES requests,
you can use this request to get one.

Note: You can also send A2S_PLAYER and A2S_RULES queries with a
challenge value of -1 (0xFF FF FF FF) and they will respond with a
challenge value to use (using the reply format below).
"

Asking for a serial with the player- or rules-character as mentioned
in the "Note" works for me  - and it is within the spec :)

Regards
  Christian Celler


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