Webclient browser error "Cannot Create .net Editor"

[Product_Support]

Issue

When schedules, reports, trend logs, loops or any calendars 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

Environment

• .Net 4.51
• Continuum webClient Server
• Internet Explorer

Cause

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

Resolution

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

Note: Always make a copy of the registry on the machine before making any modifications

1. Open regedit
2. Update the .NetFramework key as follows:
3. On an x86 Operating System
   1. Add a DWORD attribute with the name EnableIEHosting to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework
   2. Set the value to 1
4. On an x64 Operating System
   1. Add a DWORD attribute with the name EnableIEHosting to HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework
   2. Set the value to 1
5. 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: Application Compatibility in the .NET Framework.