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Subject Topic: Rewrite v2 or v3 with reverse proxy auth?
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Joined: 13 August 2010
Location: United States
Posts: 2
Posted: 13 August 2010 at 8:50pm

Hello everyone,

This is a very general question and spans Rewrite 2 and Rewrite 3, hence the question here in the common questions area:

I am trying to get basic authentication to work for reverse proxy from IIS6 to Apache2 and have a very difficult time with Rewrite 3; it simply won't work.

I have two separate machines for IIS6 (Windows 2003 server) and Apache2 (Ubuntu 10.04 LTS). If I open Internet Explorer on the Windows 2003 machine and type the URL of the Apache machine directly in IE's address bar, then I can access the web site and use the login for the fast cgi web app just fine. However, when I use the external address of the IIS6 machine instead (routing all traffic through reverse proxy), then I can navigate the web site, I can open unrestricted areas of the protected fast cgi web app, but I cannot use the login for authentication.

The interesting part is that the login windows of IE look completely different when I use the Apache's URL directly on the IIS machine vs if I use the external address.

The following illustration should give a good idea of what's going on:

Reverse proxy authentication issues IIS6 Apache2

If anybody has any inside in authentication using reverse proxy from ISS6 to Apache2 and whether Rewrite v2 or v3 should work for that, please let me know.

Many thanks!

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Joined: 30 January 2007
Location: Ukraine
Posts: 10519
Posted: 16 August 2010 at 4:07am

Please show what rules are you trying to use.
Consider putting CR flag for v3 (see details here)

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Joined: 16 February 2011
Location: Germany
Posts: 3
Posted: 16 February 2011 at 9:09am

Hello Helicon,

can you describe in an example how such a reverse proxy with back end auth is set up? Maybe as a tutorial article or so?

I actually want to do widely the same as described in the scenario above. In addition I want the following:

I want to pass the user ID for the backend auth with the original URL.


IISrewrite should then look up the Windows Active Directory user name from a (custom IISrewrite) lookup table and reverse proxy to the backend URL using Kerberos (NTLM) authentication.

How to do this?

Thank you and kind regards


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Joined: 01 October 2003
Online Status: Online
Posts: -160
Posted: 17 February 2011 at 9:07am

I think the right way to start is

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