The Old ASP.NET Webforms ReportViewer Messes Up Toolbar and Content Styles

Environment

Product	Progress® Telerik® Reporting
Version	Q2 2012 and later
Report Viewers	Legacy ASP.NET WebForms Viewer

Description

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.

Cause

The legacy ASP.NET WebForms ReportViewer displays content delivered by its Telerik.ReportViewer.axd handler.

Solution

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.axd handler is allowed for the user.