Category Archives: Telerik

Telerik RadControls IE11 javascript error

I encountered an issue after I deploy my .NET 4.0 (ASP.NET) web application to out new testing server. That server is running Windows Server 2008 R2. After deployment I started testing the web application. Soon I ended up with script error like;

Unable to get property ‘PageRequestManager’ of undefined or null reference

The issue is related to browser detection. .NET 4.0 could not detect the IE11 browser correctly to let the telerik serve correct javaScript. You can ressolve this issue by installing a patch available with Microsoft at here.

If you want to read more then head to the original Telerik artical.