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Asked: 2026-05-11T18:31:43+00:00

I have two ASP.NET sites (they can not run in the same process) and

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I have two ASP.NET sites (they can not run in the same process) and I need to share authentication between them. If a user is in site A already authenticated and then goes to site B, I need to have a way to share this information with site B so the user is not asked to authenticate again. The same is true both ways. How do you share this information?

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1 Answer

  1. Editorial Team

    Are they in the same domain?

    If you have app1.blah.com and app2.blah.com, it’s very easy to do. Just set the domain and the name to the same value in the forms-section in web.config:

    <authentication mode="Forms">
      <forms loginUrl="login.aspx"
        name=".COOKIENAME" 
        protection="All"  
        path="/" 
        domain="blah.com" 
        timeout="30" />
    </authentication>

    An added benefit is that users can sign into either site and will still be authenticated if they go to the other one.

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