Re: [squid-users] NTLM auth to remote server fails through squid

From: Peter Olsson <>
Date: Tue, 17 Jul 2012 16:07:41 +0200

On Tue, Jul 17, 2012 at 02:43:44PM +1200, Amos Jeffries wrote:
> On 17.07.2012 07:35, Peter Olsson wrote:
> > Hello!
> >
> > On Mon, Jul 16, 2012 at 09:03:00PM +0300, Eliezer Croitoru wrote:
> >> On 7/16/2012 7:05 PM, Peter Olsson wrote:
> >> > We're trying to connect to a remote server that
> >> > requires authentication. This works fine when
> >> > we place the browser client on the Internet, but
> >> > when we place the browser client behind squid the
> >> > authentication popup just returns without accepting
> >> > the login.
> >> can you please be more specific about the topology?
> >
> > My test setup is very easy. Just a single squid server
> > in plain proxy mode, using two network interfaces.
> > One interface towards Internet, the other running a
> > private network.
> >
> > I have a single PC client connected to the private interface
> > in the squid server. There is no connection from the private
> > network to the Internet without passing through the squid proxy.
> >
> > The squid server is running, with the default
> > squid.conf installed by the tarball. Only differences
> > from default squid.conf are my added visible_hostname and
> > changed http_port from 3128 to 80.
> Why?
> visible_hostname defaults to the machine system hostname.

Since this is a test server that moves around occasionally,
I don't usually have anything in it's /etc/hosts. This seems
to upset squid, which gives this error:
WARNING: Could not determine this machines public hostname.
(It's a FreeBSD 9.0 if that matters.)

> port 80 is likely to have interference from any number of firewall,
> IDS or other software digging its fingers into the traffic.

80 for historic reasons, and there are no firewalls or other
in the way.

But to keep to default configuration as much as possible,
I have now reverted to 3128 and added the server to /etc/hosts.

> > There is no transparency or
> > routing between interfaces configured in the squid server,
> > just plain proxy from inside to outside.
> >
> > The external server I'm trying to reach is on the Internet.
> > If I try to connect to this server through squid, I don't
> > get authenticated. If I however move the PC client to the
> > Internet, so it doesn't pass through squid, the authentication
> > to the external server works fine.
> There is a growing collection of known MS software which cannot handle
> the HTTP/1.0<->HTTP1/.1 gateway nature of Squid-3.1 series. But this
> should not be an issue with 3.2 series.
> Please update to the latest beta though before doing more testing.
> is out and the latest snapshot has some relevant bug fixes.
> 3.2 would be best to test with since it provide a full HTTP header
> trace at "debug_options 11,2". Those header trace will be the best
> starting point to track this down.

Now I run Squid Configuration is default
except that I have added debug_options 11,2 at the top of squid.conf.

Same problem in IE 9, three auth popups and then the browser error page:
You are not authorized to view this page
HTTP Error 401.1

One thing I forgot to mention yesterday is that there is a rather
long wait (about 20-30 seconds) before the first auth popup.
Then there is a shorter wait (a couple of seconds) for the second
popup, and the third popup comes up immediately after the second
has been entered.

I don't see anything strange in cache.log, what should I look for?
Or can I post the debug to the list or in private email?
It's about 600 lines in total for the three failed auth attempts.


Peter Olsson
Received on Tue Jul 17 2012 - 14:07:47 MDT

This archive was generated by hypermail 2.2.0 : Wed Jul 18 2012 - 12:00:02 MDT