Question

Internet Explorer 8 cannot use Windows Authentication through reverse proxy; Firefox/Chrome can

Asked by: L_Potter

Hi all,

  I am having an issue with IE8 attempting to connect to a site via a reverse proxy server.  In both Firefox and Chrome, when I attempt to access the site (i.e. enter http://reverse-proxy-name/test-name-here), everything works as expected.  When I attempt to use IE8, I receive a prompt asking me for my user name and password.  This prompt indicates that IE is attempting to connect to reverse-proxy.domain-name.com.  Regardless of what I enter (login name and password; domain-name\user name and password; domain-name.com\user name and password, et al), I cannot access the site (I receive a 401.1 error).

  If I understand correctly, the requests sent from the three browsers should be identical; as such, I'm at a bit of a loss why IE won't behave.  Any help would be greatly appreciated; specifically, I'm having a bit of trouble determining why I'm even prompted for a password when using Windows Authentication (which works fine when connecting to the website directly without using the reverse proxy).  Thanks for your time.

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Asked On
2009-07-23 at 08:24:48ID24594927
Tags

IE

,

Internet Explorer

,

reverse proxy

,

Windows Authentication

,

Firefox

Topics

Internet Explorer Web Browser

,

Firefox Web Browser

Participating Experts
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Answers

 

by: BytyPosted on 2009-07-25 at 23:40:48ID: 24944562

I do not know what exatly is your problem but check in IE
Tools> Internet Options > Advanced > Scrol down to HTTP 1.1 setings check Use HTTP 1.1 trough proxy conections.

 

by: L_PotterPosted on 2009-07-27 at 06:29:50ID: 24951286

Hi again,

  I found the solution to this problem, or at least the problem for me.  The server behind the reverse proxy was using Negotiate,NTLM security.  By running Wireshark, I fould that when Firefox/Chrome made a request, it would first attempt to connect with no authentication.  When the server sent back an access denied error, these browsers would then attempt to connect using NTLM, which worked as expected.  When IE made the request, it first connected without authentication, was refused, and then tried to connect using Negotiate authentication.  Upon doing this (and failing), the reverse proxy would then prompt for a user name/password combination as opposed to passing the required credentials to the web server.  By disabling Negotiate authentication on the web server, I was able to circumvent this.

  Luke

20120131-EE-VQP-002

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