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POShare authentication cookie/membership provider between two sites - second site never authenticates
 

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    <p>I have two ASP.NET 4.0 sites on Win2008R2 IIS7, e.g. demo1.site.domain.com and demo2.site.domain.com, and I want to have single sign on. I have searched around and have configured the web.config of both sites like so</p> <pre><code>&lt;machineKey validationKey="ABCDEFG" decryptionKey="HIJKLMN" validation="SHA1" /&gt; &lt;roleManager defaultProvider="RoleName"&gt; &lt;providers&gt; &lt;add name="RoleName" type="Assembly.RoleProvider, Assembly, Version=1.0.0.0, Culture=neutral, PublicKeyToken=a1b2c3d4e5f6g7h8i9" /&gt; &lt;/providers&gt; &lt;/roleManager&gt; &lt;membership defaultProvider="MembershipName"&gt; &lt;providers&gt; &lt;add name="MembershipName" type="Assembly.MembershipProvider, Assembly, Version=1.0.0.0, Culture=neutral, PublicKeyToken=a1b2c3d4e5f6g7h8i9" /&gt; &lt;/providers&gt; &lt;/membership&gt; &lt;authentication mode="Forms"&gt; &lt;forms loginUrl="http://demo1.site.domain.com/login.aspx" name=".ASPXAUTH" domain="domain.com" protection="All" path="/" /&gt; &lt;/authentication&gt; &lt;authorization&gt; &lt;deny users="?" /&gt; &lt;/authorization&gt; </code></pre> <p>In other words the machine key is the same on both web sites and the membership/role providers exist in the assembly of the first site and is used by the second.</p> <p>The problem I've got is that it doesn't work. I have used fiddler to see what is happening and the auth cookie is never sent to the second site so it always redirects to the login page. </p> <p>Am I missing something obvious? </p> <p>Thanks, Nik</p>
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    1. COIs the second site under the same domain as the first? If not, the cookies will not be sent.
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    2. COi've edited the domain. They are both under the same domain (i've deliberately changed the actual name). They are on the same server and their bindings are demo1.site.domain.com demo2.site.domain.com
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