I move my web sites from IIS6 to IIS7.5 , I used custom user for Anonymous authentication for each web sites. Now When I change web.config on asp.net websites or restart the websites. I see login dialog box when I try to browse sites. And I have to set the user and password on anonymous authentication to solve this problem. I can’t understand why this authentication settings reset. How can I fix this problem permanently?

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I find why this occure. IIS7 edit my web.config and add a security entry , when I delete this element sites work – Ashian Oct 12 '10 at 11:30
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can you share in details the procedure of migration and way out to resolve the authentication problem?

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