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If the CustomErrorsSection.DefaultRedirect is not specified, a standard error is displayed instead. The CustomErrorsSection.DefaultRedirect specifies the generic error page to activate in case no error custom page exists.
The URL might be an absolute or a relative value. A relative URL is relative to the Web.config file that specified the CustomErrorsSection.DefaultRedirect, not to the Web page in which the error occurred. A relative URL starting with a tilde (~) is relative to the root path of the application.