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Editorial Team
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Asked: 2026-06-04T07:06:30+00:00

We have an ASP.NET website set up using Active Directory as the Membership Provider.

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We have an ASP.NET website set up using Active Directory as the Membership Provider. The site uses the Forms authentication mode and the .NET Login control. We recently merged with another company and now they also need access to the site, but they are of course on a different domain. Our IT people have set up the two Active Directories in a two-way trust.
I can log on to their domain using a test account from our network. But when I use the same DOMAIN\username + password combo on my website it does not work.
How can I make our site able to see users on the second domain? Is this not possible using the Login control? Or is there something else I’m missing?

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  1. Editorial Team

    I don’t think it’s possible to authenticate against a remote AD domain, via a trust with the built-in provider. You could setup a second provider which is configured to point at the other domain, and then add addition logic to your Login control to pick the right provider to authenticate against. I use a similar approach to support “pass-through” authentication of domain users while also support non-domain users with standard forms authentication.

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