SharePoint 2010 FBA with custom form - 403 error

Posted by Chris R Chapman on Stack Overflow See other posts from Stack Overflow or by Chris R Chapman
Published on 2010-05-06T15:01:30Z Indexed on 2010/06/02 12:13 UTC
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I have a SharePoint 2010 site that is configured for Forms Based Auth using custom role, membership and profile providers. This works perfectly using the OOTB SharePoint 2010 FBA form (ie. under /_forms in the web app virtual directory).

My problem is with a custom login form that is located in a separate folder, /Landing/Login/default.aspx. I've configured the web app to point to this form (contains an unmodified ASP.NET login control), which is rendered when the user hits the root URL. The problem comes when they submit their credentials and the form posts back for the redirection to /_layouts/Authenticate.aspx. It stops cold with a 403.

If I revert back to the OOTB FBA form (using the same providers) everything works fine. Any suggestions on what could be going wrong?

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