The problem with error message 'The answer you provided is not valid' is occurring because security question and answer have been enabled for the membership provider in Administration->Settings->Advanced->Security->Membership Providers->Default->Parameters-> securuityQuestionAndAnswer, edit the Value
textbox and set it to false
. Restart the application and the problem will be gone. There is a bug in Sitefinity that security question and answer are not working because when you enable them they require security question and answer fields to be filled for each user, but there are no such fields exposed.
the Telerik team
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