Error "An add-on for this website failed to run" in EngageOne Interactive Editor (EngageOne Server)

Product Feature: EngageOne Interactive, EngageOne Server


Internet Explorer add-on fails to run when trying to edit a document in EngageOne Interactive Editor. Error message observed in Internet Explorer window is as follow:

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A corresponding error log is found in Windows Event Viewer where EngageOne Interactive is installed at (in this example it's dv16):
Attempt to install control http://lghbdv16:8080/EngageOneCorrespondent/ax-editor/ failed. The host URL http://dv16 is not in policy


ActiveX control installation is not enabled for the machine or server under which EngageOne Interactive is installed.


UPDATED: July 8, 2019
A Group Policy change is required. Please go through the following steps from within the machine where EngageOne Interactive is installed:

1. From Start / Run, type GPEDIT.MSC to launch the Group Policy Editor console
2. Go to Local Computer Policy / Computer Configuration / Administrative Templates / Windows Components / ActiveX Installer Service
3. Double click "Approved Installation Sites for ActiveX Controls" to edit the policy settings

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4. Ensure that "Enabled" radio button is selected.
5. Click on Host URLs "Show" button and add the server domain and the value 2,2,1,0 e.g.

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6. Click OK on above prompt
7. Click Apply, then OK on the "Approved Installation Sites for ActiveX Controls" prompt