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Date: Sat, 30 Dec 2000 18:21:54 +0100
From: Matthias Andree <matthias.andree@stud.uni-dortmund.de>
To: linux-kernel@vger.kernel.org
Subject: Re: SYN_SENT block
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In-Reply-To: <20001227162518.A25171@confucius.usc.edu>; from rapela@sipi.usc.edu on Wed, Dec 27, 2000 at 16:25:18 -0800
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On Wed, 27 Dec 2000, Joaquin Rapela wrote:

> I am not a linux kernel guy. I am running a spider that sometimes gets
> blocked for long periods of time.  I run a "netstat -nto" and I
> observe a socket in state SYS_SENT that seems to be blocked. Its timer
> keeps on incrementing. 
> 
> Is there any way to avoid this blocking? Is this a bug in the kernel
> or something wrong in my TCP/IP configuration/settings.

There's something wrong with the network: Your SYN packet that is to
establish the connection to the other machine is never answered by your
"victim".

There's nothing you can do about that. Talk to non-firewalled, working
machines to prevent that. Possibly try to connect() to several sockets
at once (use fork or threads).

-- 
Matthias Andree
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