A number of customers have recently encountered an issue following the latest TLS1.2 update. This presents itself as Windows Media Player on Windows 7 displaying a generic error message and is unable to play an MP4 video launched directly from the platform.
Windows Media Player uses the default settings from WinHTTP, which needs to be modified to support TLS 1.2 by default. A Microsoft patch needs to be applied to enable support for TLS 1.2. For more information please refer to the heading "How to get this update" on the Microsoft Knowledgebase Article: Update to enable TLS 1.1 and TLS 1.2 as default secure protocols in WinHTTP in Windows
Once the patch is applied the registry will need modifying to enable TLS 1.2. Please refer to the "Easy fix" heading on the Microsoft Knowledgebase Article: Update to enable TLS 1.1 and TLS 1.2 as default secure protocols in WinHTTP in Windows to apply an update.
The patch and registry key chance can be managed by central IT management, and we would suggest consulting with your internal IT support to ensure these changes go out across all users to allow access to video content.