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Editorial Team
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Asked: 2026-05-14T02:54:20+00:00

I am trying to set up Single sign on for 2 websites that reside

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I am trying to set up Single sign on for 2 websites that reside on the same domain

e.g.

http://mydomain (top level site that contains a forms-auth login page)

http://mydomain/admin (seperately developed website residing in a Virtual Application within the parent website)

Have read a few articles on Single Sign on
e.g.

http://www.codeproject.com/KB/aspnet/SingleSignon.aspx

http://msdn.microsoft.com/en-us/library/dd577079.aspx

And they seem to suggest it is just a case of having the same machinekey section in each web.config so that the cookie encryption and decryption is the same for each application

I have set this up and I never get prompted for credentials in the sub-website (the virtual application)

I always get prompted in the parent site.

In addition to having the same machinekey I’ve also tried adding the same <authentication> and <authorisation> elements

Any idea what I could be missing?

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1 Answer

  1. Editorial Team

    I had used <clear/> on the httpModules section, as there were items in the parent that did not exist in the bin dir for the child (/admin)

    In doing so (using <clear/> that is ) I had inadvertently cleared the FormsAuthentication module specified in the web.config in
    C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG

    so i needed to re-add those explicitly to the child (/admin) config

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