Re: squid proxy issue

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Thu, Oct 21, 2010 at 04:05:28PM +0100, Tuan Nguyen wrote:
> Hi all,
> 
> We're experiencing this strange issue with squid on NetBSD (5.1
> RC3). During busy hours we're seeing repeated error messages in
> squid's cache.log:
> 
> Failed to select source for 'http://...'
> TCP connection to x.x.x.x/3128 failed
> TCP connection to x.x.x.x/3128 failed
> TCP connection to x.x.x.x/3128 failed
> ...
> 
> x.x.x.x is the upstream proxy as configured in squid.conf:
> cache_peer x.x.x.x parent 3128 0 no-query default name=x.x.x.x:3129
> 
> As a result, on client machine a user would see "Unable to forward
> this request at this time" message on their browser. This doesn't
> occur when network is less busy and we're seeing the same issue with
> different upstream proxies. Is there anything we could tweak on
> squid/NetBSD to overcome this or parent proxies are the one to blame
> here? Any advice would be great. Thanks.

Did you check if squid is hitting some ressource limit, maybe
file descriptors ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--