After upgrading from Horizon 8 2006 to Horizon 8 2012, audio stopped working. When connected to a VDI session, audio is not being passed through to the client.
Audio simply does not work. Using the Chrome and multimedia redirection, audio will work, but this is most likely due to the fact the client is handling multimedia.
Removing the audio drivers (forcing uninstall/deleting the audio driver) and re-installing the agent does not correct this.
Uninstalling and reinstalling the Horizon Client does not correct this.
Audio does function on the Horizon Android client so I isolated this to the Windows client.
After further troubleshooting, I opened the Windows Sound mixer (Right click on the audio icon in the system tray, select “Open Volume Mixer”). I noticed that not only was the VMware Horizon client at 0, but it was also muted.
Unmuting this and raising the volume slider resolved the issue.
As most of you know (or didn’t), Adobe Flash reached it’s End of Life on December 31st 2020, and as of January 12th 2021 does not function at all!
Since Adobe is no longer supporting Flash, they are blocking and disabling all Flash content beginning January 12 2021 from web browsers including Chrome.
For IT folks, this causes big problems when managing, maintaining, or dealing with older systems that use Adobe Flash, such as older versions of VMware vSphere, vCenter/vCSA, and VMware Horizon. This is because the admin interfaces utilize Adobe Flash. This will also apply to other software and systems.
Up until now while approaching the end of life date, special steps were required to allow Adobe Flash because of security concerns.
As of January 12, 2021 these steps no longer work. Even when choosing to “Allow” flash, Adobe will deliberately block it. You’ll see something similar to below.
This workaround should only be used for emergency situations as you should truly try to reduce your dependence on Flash.
In order for this workaround, you will need Chrome Version 87 or earlier. Version 88 does not include Adobe Flash.
On Windows, you’ll need to create a file called “mms.cfg” in the following path:
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