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Article: 1084
From: Anthony Howe
Date: 2006-08-04 18:28:46 -0400
Subject: Re: Milter-ClamC "450 4.7.1 anti-virus session write error"

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Taylor, Grant wrote:
> 450 4.7.1 anti-virus session write error
> According to the Snert web site this is because "There was a problem 
> passing input to the clamd session.".
> Does any one have any idea what possible causes for such an error would 

Have you checked if the clamd process has died? I've seen it die 
sometimes after a freshclam update.

Anyway, I've recently changed this in milter-clamc for the next release:

    !	Accept the message in the event of an clamd socket error,
    	instead of temporaily rejecting the mail. Better to let
    	the mail keep flowing. Sometimes clamd disappears.

> be?  most of my email is flowing through the virus scanner just fine.  
> The only thing that comes to mind is that the message is 10,765,302 byes 
> in size and that it may be tripping some sort of size filter that is set 
> up in side of clamd.

Possibly. Never thought of that. You try setting


about 64KB smaller than clamd's max size and see if milter-clamc is more 
graceful when it knows to limit message size. Note that because of how 
the sendmail / milter passes date, clamd-max-size is convert into max. 
number of 64KB chunks rounded up. So if you specify clamd-max-size=32, 
it would actual do 64KB.

Anthony C Howe          Skype: SirWumpus                    SnertSoft
+33 6 11 89 73 78         AIM: SirWumpus    Sendmail Milter Solutions
http://www.snert.com/     ICQ: 7116561

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