Wednesday, July 23, 2014

Lync 2013 Client, Desktop Sharing shows blank screen (Windows 7, Windows 8, Windows 8.1)

I came across this problem, where a customer reported:
A user could not participate on desktop sharing session, neither in conference nor in a p2p session. Other video related submission were working, like video or white board.
First I was guessing it could have been the video driver, but if video in Lync was working it didn't sound quite logic.

After investigating this problem, I saw a ActiveX blocking Error Message in the Eventviewer:

Microsoft Lync
CLSID: {00000000-0000-0000-0000-000000000000}
CATID: {9B179D6E-9BDB-454b-BE3D-89F9A792BD39}
The ActiveX Compatibility setting disabled loading this object to help protect your security.


This let me investigate more closer into Internet Explore. Well even there is couldn't see anything directly:

Microsoft reports several TechNet article:

So you need to change the ActiveX Control Settings for Lync 2013 Client:


Go and delete both registry keys. A reboot is not necessary and it will work.

In Windows 7, Windows 8 and Windows 8.1 they are hidden here:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\ActiveX Compatibility\{00000000-0000-0000-0000-000000000000}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{00000000-0000-0000-0000-000000000000}


  1. Great stuff, wrote down the powershell cmdlets for last time I encountered it :)

    1. Hi Stale,
      perfect, why I didn't see your blog.

      please all, have a look into Stale's blog, very detailed and you can simply copy script from him, which you than can implement with your GPO's.