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This post has been migrated, original date 18 Aug 2009 According to MSDN the class Microsoft.SharePoint.WebControls.UnsecuredLayoutsPageBase, Microsoft.SharePoint should be used to give anonymous users access to page. However despite in inheriting from the class you might still get a 401 Unauthorised error. Not only do you need to inherit from this class but you also need to override the AllowAnnoymouseAccess property and set it to return true:
public class Login: Microsoft.SharePoint.WebControls.UnsecuredLayoutsPageBase{
	 protected override bool AllowAnnonymouseAccess{
	 	 	 return true;

I am not sure why this class needs this additional property but once added it worked fine.
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