[squid-users] Software caused connection abort

Amos Jeffries squid3 at treenet.co.nz
Mon Aug 31 15:11:57 UTC 2015

On 1/09/2015 1:52 a.m., Corbo, Nelson wrote:
> Antony thanks for your quick reply
> About request it looks to be this one:
> Acces.log
> 		1441029005.619 2159098 TCP_TUNNEL/200 23389 CONNECT outlook.office365.com:443 - HIER_DIRECT/ -
> Cache.log
> 		2015/08/31 10:50:05 kid1| local= remote= FD 93 flags=1: read/write failure: (113) Software caused connection abort

The error is not coming from Squid itself, but from the system
(specifically the TCP stack) underneath Squid.

Whats going on there is that Squid is asked to setup a tunnel, it does
so. ~23KB of data transits within 36sec, then the TCP connection between
Squid and the client is terminated by "something" happening in the middle.

An educated guess is that all that 23K was transmitted in ~6sec. then
nothing happened until a 30sec TCP or NAT timeout triggered in a router
or switch along the path.


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