Videos not playing in IE, termnal server sessions.

Unable to play videos in RDP session.

I administer a site that uses multiple RDS servers. The servers run as VMS under HyperV or Xen.  They all run Server 2008R2. Clients are mostly Wyse C10LE's with a few PCs.

The problem I have is that video content does not show in Internet Explorer11. If I got to Youtube and try to play a video, I just get "An error occurred, please try again later". Chrome works fine.

I have tried:
1. Using a Win10 PC instead of a Wyse client, no difference.
2. Toggled "Use software rendering instead of GPU rendering" under advanced IE options, (and rebooted), no difference.
3. Added YouTube to the trusted sites list, no difference.
4. Logging on with an admin account, no difference.

Any ideas?
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Mal OsborneAlpha GeekAsked:
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Mal OsborneAlpha GeekAuthor Commented:
Figured it out after a heap of Googling. Known issue, fixed by a Hotfix.

More here: https://support.microsoft.com/en-us/help/2483177/fix-you-cannot-play-back-an-h-264-video-file-or-an-aac-audio-file-on-a
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Windows Server 2008

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