I trying to simplify to the maximum all user alerts related to ActiveX/Plugins needed for Skype for Business Web-App to work ( it is an On-prem Skype for business installation).

What I did so far is:

  • Configure the website FQDN (entrypoint) as trusted site (value 2).

    Windows Components/Internet Explorer/Internet Control Panel/Security Page/Site to Zone Assignment List/

  • Enable the execution of all ActiveX

Windows Components/Internet Explorer/Internet Control Panel/Security Page/Trusted Sites Zone\ Run ActiveX controls and plugins, set to Enable

  • The plugin that is trying to load seems to be in the same domain but just in case I also set

Windows Components/Internet Explorer/Internet Control Panel/Security Page/Trusted Sites Zone\ Allow only approved domains to use ActiveX controls without prompt , set to Enable -> Disable.

But still, when the Skype webapp is launched, I keep receiving the following popup.

Any idea how to get rid of it?

enter image description here

1 Answer 1


I finally found the solution after using the tool Zsof Uninstaller http://www.zsoft.dk/ to trace all the action performed by the MSI.

Some entries called my attention REG ADDED! HKU S-1-5-21-2739979431-3630490944-714476731-53848\Software\Microsoft\SkypeForBusinessPlugin\15.8\AllowedDomains

and I also found in google some instructions for Lync, the previous name of the same webapp. https://support.microsoft.com/en-us/office/trouble-installing-the-plug-in-3dba99b4-0f57-4ed7-9d70-682188c53404?ui=en-us&rs=en-us&ad=us#__toc378335123

so basically I just needed to create a registry entry via GPO with the FQDN mentioned in the popup. HKEY_CURRENT_USER\Software\Microsoft\SkypeForBusinessPlugin\15.8\AllowedDomains

After that, popup will no appear anymore.

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