The Old ASP.NET Webforms ReportViewer Messes Up Toolbar and Content Styles
|Progress® Telerik® Reporting
|Q2 2012 and later
|Legacy ASP.NET WebForms Viewer
The described scenario and suggested solution relate to the legacy ASP.NET WebForms ReportViewer. It is recommended that you migrate to the HTML5 ReportViewer.
The legacy ASP.NET Webforms ReportViewer messes up the styles of its toolbar and content area.
The legacy ASP.NET WebForms ReportViewer displays content delivered by its
To solve this issue, use the following approaches:
Make sure that the handler is registered correctly and that the browser proxy and security settings allow it to deliver content.
If you are using authorization, verify that the path of the
Telerik.ReportViewer.axdhandler is allowed for the user.