In Horizon 6.0.1 and earlier, Horizon Client provides the Windows 7 MMR feature for Windows 7 desktops and clients. You can take steps to provide enough time for clients to initiate Windows 7 MMR.

About this task

Windows 7 MMR uses a handshake between the Horizon Client system and the desktop to validate requests for multimedia redirection. Under certain network conditions, this handshake can take too long to complete, which causes MMR not to be initiated. To ensure that Windows 7 MMR can be initiated, you can configure a Windows registry key on the desktop to increase the time allowed for the validation handshake to complete.

The Windows registry key controls the handshake Time to Live (TTL) value and is set in milliseconds. The value is in REG_DWORD (hex) format. The default value is 5000 milliseconds (five seconds).

Before you deploy Windows 7 MMR to your View users, test a few client systems to check if the default time allowed to complete the handshake is adequate in your environment. If your network conditions require a longer handshake than five seconds, increase the TTL value.


  1. Start the Windows Registry Editor on the remote desktop.
  2. Navigate to the Windows registry key that controls the MMR validation handshake.



    Windows 7 64-bit

    HKEY_LOCAL_MACHINE\Software\Wow6432Node\VMware,Inc.\VMware VDPService\handshakeTTL

    Windows 7 32-bit

    HKEY_LOCAL_MACHINE\Software\VMware,Inc.\VMware VDPService\handshakeTTL

  3. Increase the handshakeTTL value to a number that is greater than 5000.
  4. Restart Windows Media Player on the desktop to allow the updated value to take effect.