RedCaptcha doesn't appear on mobile

[Igor]

I am using RedCaptcha on registration page and it works ok, but if i open this page from mobile device (or emulating it in browser) the redcaptcha image doesn't appear. If i open link from captcha src="" attribute in new tab i see the image.

You can see this issue by this url: 
https://demo.provantportalstaging.com/_layouts/15/Provant.CustomerPortal.Authentication/Participant%20Pages/Registration.aspx

Maybe you have faced such issue earlier. 
Any help will be appreciated

[Marin Bratanov]

Hi Igor,

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 not appear.

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: 

<telerik:RadCaptcha ID="RadCaptcha1" Runat="server" ForeColor="Red"
 ErrorMessage="You have entered an invalid code." HttpHandlerUrl="~/_layouts/Telerik.Web.UI.WebResource.axd">
</telerik:RadCaptcha>

Regards,

Marin Bratanov
Telerik

[Igor]

HttpHandlerUrl="~/_layouts/Telerik.Web.UI.WebResource.axd" solved my problem.

 Thank you, Marin!