is the HTTP web resource handler some of RadControls use to fetch scripts, styles and sprite images. Unfortunately, ASP.NET resource handlers are not very much venerated by web security products, as they are often treated as a web security vulnerability. Part of the suspicious behavior of the script resource handlers is that there is no physical file named WebResource.axd (or ScriptResource.axd for standard ASP.NET ScriptManager) present in the web site root.
Try creating an empty WebResource.axd file and see if you are getting the same warnings.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items