Progress® Telerik® UI for ASP.NET AJAX Feedback Portal
Back to Feed
Request a Feature Report a Bug
In Development
Last Updated: 16 Apr 2026 08:21 by ADMIN
Scheduled for 2026 Q2
Gandhi
Created on: 03 Dec 2021 12:59
Category: StyleSheetManager
Type: Bug Report
3
"The cryptographic operation has failed!" error when showing a hidden control and there is RadStyleSheetManager and EnableHandlerEncryption=true

Repro: 

<telerik:RadStyleSheetManager runat="server"></telerik:RadStyleSheetManager>

<asp:UpdatePanel runat="server">
    <ContentTemplate>
        <asp:Button Text="Postback" OnClick="Unnamed_Click" runat="server" />
        <telerik:RadButton runat="server" Visible="false" ID="RadButton1" Text="Telerik button" AutoPostBack="true" />
    </ContentTemplate>
</asp:UpdatePanel>

protected void Unnamed_Click(object sender, EventArgs e)
{
    RadButton1.Visible = true;
}

<add key="Telerik.ScriptManager.EnableHandlerEncryption" value="true" />

 

Workaround:

Temporarily set EnableHandlerEncryption to false or do not use a StyleSheetManager

<add key="Telerik.ScriptManager.EnableHandlerEncryption" value="false" />

3 comments
ADMIN
Rumen
Posted on: 16 Apr 2026 08:21

Hi everybody,

The reported problem will be addressed in the upcoming major 2026 Q2 release, due in the second half of May.

 

Regards,
Rumen
Progress Telerik

Stay tuned by visiting our public roadmap and feedback portal pages! Or perhaps, if you are new to our Telerik family, check out our getting started resources! 
ADMIN
Attila Antal
Posted on: 20 Dec 2022 10:01

Hi Nate,

At the moment the item is still on the ToDo list. We haven't worked on it yet as our developers have their roadmap planned ahead. 

I suggest that you click on the Follow button to get notifications about any upcoming changes. 

Regards,
Attila Antal
Progress Telerik

Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Check it out at https://learn.telerik.com/.

Nate
Posted on: 13 Dec 2022 16:38
Any progress on this issue?  we look forward to reenabling the encryption!
Create an account Log In
View
Type
Status
Category