Re: [squid-users] Squid 3.2.0.14: "failed to select source for ..."

On 13/02/2012 7:20 p.m., Helmut Hullen wrote:
> Hallo, Amos,
>
> Du meintest am 11.02.12:
>
>>> my self made squid 3.2.0.14 sometimes produces messages like
>>>
>>> Jan 30 08:56:58 Arktur squid[4263]: Failed to select source for
>>> 'http:// ivwbox.de/'
>>> Jan 30 08:56:58 Arktur squid[4263]: always_direct = 0
>>> Jan 30 08:56:58 Arktur squid[4263]: never_direct = 0
>>> Jan 30 08:56:58 Arktur squid[4263]: timedout = 0
> [...]
>
>>> Where's the problem?
>>> Is that message an information, a warning or an error message?
>> Direct access is permitted, but DNS produced no usable results.
> Why (as far as you can be clairvoyant)?
>
> It doesn't happen always, it only happens sometimes.

I don't have an answer for that. Although in a completely different
scenario I get DNS failures when the network is congested (same end result).

> That makes testing difficult - I don't dare to run the new squid version
> on a "productive" system, and the last time I've seen this message on my
> local system is some weeks ago.
>
> As I've told some days ago both machines where I've seen these messages
> run "dnsmasq" as DNS, not ISC-bind.
>
> Restarting squid helps for some time, but maybe the real problem would
> have disappeared by only waiting some time too ...

Like Ralf mentioned...

## host-check ivwbox.de
ivwbox.de has SOA record ns.ivwbox.de. hostmaster.ivwbox.de. 2011061896
10000 3600 604800 86400
ivwbox.de has no A record
ivwbox.de has no AAAA record
ivwbox.de has no CNAME record
ivwbox.de has no TXT record
ivwbox.de mail is handled by 50 mail.ivwbox.de.
ivwbox.de name server ns2.ivwbox.de.
ivwbox.de name server ns4.ivwbox.de.
ivwbox.de name server ns.ivwbox.de.
ivwbox.de name server ns3.ivwbox.de.
ivwbox.de name server ns5.ivwbox.de.

The absent results for both A and AAAA is fatal for most of us trying to
access the website there. If any of those servers are producing A or
AAAA records, or if your dnsmasq server is producing different results
occasionally things could get rather strange.

Or it could just be confusion between ivwbox.de and www.ivwbox.de which
does have an IP address:

## host-check www.ivwbox.de
www.ivwbox.de has no SOA record
www.ivwbox.de has address 193.46.63.10
www.ivwbox.de has no AAAA record
www.ivwbox.de has no CNAME record
www.ivwbox.de has no TXT record
www.ivwbox.de has no MX record
www.ivwbox.de has no NS record

PS: Beware of tools which silently or automatically prefix "www." to
non-resolvable domain names.

Amos
Received on Mon Feb 13 2012 - 12:08:01 MST