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IIS Basic Authentication in Cross Realm Environment

Posted on 2007-11-30
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Last Modified: 2013-11-05
Hi,

Situation:
- I have a Windows 2003 Active Directory Server for DOMAIN1.
- It is also configured for cross realm authentication on DOMAIN2 with a user mapping from *.DOMAIN2 to *.DOMAIN1.
- An account for User1 is present is both domains.

What is working:
When I log on through RDP from a non-domain computer to the Active Directory with the DOMAIN2 credentials of User1, the authentication succeeds.

Problem:
When I configure IIS for Basic Authentication, and set the default domain to DOMAIN2, the authentication fails with a 401 error. When I sniff the kerberos traffic however, I can see a successful authentication to the DOMAIN2 KDC. When using the DOMAIN1 credentials for User1, the authentication succeeds.

Question:
How can I achieve cross realm authentication in IIS?

Thanks is advance!

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Question by:CuSo4
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ahoffmann earned 500 total points
ID: 20387721
> How can I achieve cross realm authentication ..
you cannot 'cause the browser does not allow to violate cross-domain authentication 'cause of security reasons

> .. in IIS
it's not a web server but a client (browser) issue, see above
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Author Comment

by:CuSo4
ID: 20387767
Hi,
Thanks for the feedback!

I understand that the client will not perform kerberos authentication in a non-intranet environment.
However, what I am trying to achieve is that the client uses basic authentication (over ssl) to authenticate to the web server on DOMAIN1, and that the server on DOMAIN1 checks the credentials through kerberos with DOMAIN2.

I think a similar form of authentication is used when I connect using Remote Desktop from a non-intranet PC to the server on DOMAIN1, so I believe the same should be possible for IIS authentication...
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