When anonymous access (http://blog.cloudshare.com/2012/10/15/how-to-enable-anonymous-access-to-a-sharepoint-2013-site) is enabled and the page is viewed from a mobile browser, the HttpHandler that serves the
captcha image should be requested in a folder that can be accessed by
anonymous users. If the HttpHandler is not configured, the image will
You should open the page with the captcha and use the HttpHandlerUrl property of the control to configure it to request Telerik.Web.UI.WebResource.axd in a folder that is accessible, for example _layouts:
"You have entered an invalid code."
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