Browser throws a Cannot Create .net Editor error.


The resolution of this article has many complex steps that may result in unforeseen results if not performed correctly. If you are at all unfamiliar with the requirements, please contact Product Support Services for assistance.


When a schedules, reports, trend logs, loops, any calendar are loaded Internet Explorer is rejecting the control and will not host it.  IE will then throw a “Cannot Create .net Editor” error.  

Product Line

Andover Continuum


  • .Net 4.51
  • WebClient
  • Internet Explorer


Microsoft has stopped allowing IE to host controls from .net 2.0 and 1.1 by default.


In order for these controls you must do the following on all of your client machines:


  1. Open regedit
  2. Update the .NetFramework key as follows:
  3. On an x86 Operating System
  4. Add a DWORD attribute with the name EnableIEHosting to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework
  5. Set the value to 1
  6. On an x64 Operating System
  7. Add a DWORD attribute with the name EnableIEHosting to HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework
  8. Set the value to 1
  9. Reboot the computer

At this point you should be able to start WebClient and run the .net editors without any problems.

The following Microsoft Article discusses this issue.