It's in the first line of the log he pasted ;)

Are you running any addons (+ plugins) on both servers?
The "No challenge" lines can usually be ignored from what I heard.

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Saul
Rennison
Sent: Mittwoch, 12. Mai 2010 14:33
To: Half-Life dedicated Linux server mailing list
Subject: Re: [hlds_linux] A2C_PRINT, can it DOS a server?

That's the master server talking to you there. Where does it say Steam
connection was lost, anyway?

On Wednesday, May 12, 2010, Peter Reinhold <[email protected]> wrote:
> Hi all,
>
> I have been observing some random fallouts (all people getting
> disconnects, and reconnect after 20-30 seconds) on my L4D2 servers,
> and I have been trying to figure out whats causing the problem.
>
> First thought was that the server simply was overencumbered, even
> though its running at around 80% utilization when all forks are filled.
>
> But then I observed the same behaviour just now, and at the time,
> only 2 forks were populated (around 15% utilization), and what was
> even stranger, a TF2 server I am also running, did the same exact
> thing, and there were no players on that at all.
>
> In the TF2 log, I could see the following.
>
> --
> Connection to Steam servers lost.
> A2C_PRINT from 216.207.205.99:27011 :
> No challenge for your address.A2C_PRINT from 216.207.205.98:27011 :
> No challenge for your address.Connection to Steam servers successful.
>     VAC secure mode is activated.
> --
>
> It seems like theres an A2C_PRINT connection, which in turn causes
> the server to loose connection to the Steam servers.
>
> Am I correct in assuming that the A2C_PRINT is the cause for these
> system hiccups?
>
> And if so, are there any way to disable them? (Are they needed for
anything?)
>
>
> Thanks in advance,
>
> Peter
>
>
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>

-- 

Thanks,
 - Saul.

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