Varnish 2.1.4 issue with ISA proxy

Angelo Höngens a.hongens at
Wed Feb 9 20:36:25 CET 2011

On 9-2-2011 20:28, linuxsupport wrote:
> Hi,
> I have varnish 2.1.4 running for last 3 months, everything was working
> well, suddenly I got complaints from multiple users that they can not
> open the sites.
> users are using ISA porxy to reach to internet, it seems issue when ISA
> and Varnish both are used, users made some test and reported as below.
> 1. If they do not use ISA proxy sites open perfectly (bypass ISA proxy)
> 2. If they do not use Varnish sites works well (bypass Varnish)
> On firefox half of the page open, and on Chrome it says duplicate
> content-length error.
> I am not sure why this happens when both ISA and Varnish are used.
> Please let me know if anyone else encountered the same issue.

I saw some posts a while back on this list about a bug in varnish that
caused it to send (or pass?) duplicate content-length headers in the
response. For most proxies and/or browsers it's not a problem, but
apparently ISA has a problem with it.

Search on the list, and you will find more details about it.


With kind regards,

Angelo Höngens
systems administrator

MCSE on Windows 2003
MCSE on Windows 2000
MS Small Business Specialist
tourism internet software solutions

Ringbaan Oost 2b
5013 CA Tilburg
+31 (0)13 5811088
+31 (0)13 5821239

A.Hongens at

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