Unable to view lock screen when using Knox Remote Support on desktop

Environment

• Knox SDK
• Knox Remote Support
• Devices running Android 13 and higher

Overview

When using Knox Remote Support to control a device, users may encounter an issue where the lock screen of the device and some apps are displayed as a black screen on the Knox Remote Support interface.

Use of FLAG_SECURE in the lock screen

Apps that use the FLAG_SECURE flag prevent viewing of content on certain displays. As of Android 13, the FLAG_SECURE flag is applied to lock screens when displaying a PIN, password, or pattern prompt, causing the Knox Remote Support Viewer interface to display a black screen instead. Your remote session may also be interrupted by other apps that use FLAG_SECURE to secure their displays.

Additionally, apps that set this flag can prevent screen recordings and screen captures by replacing them with a black screen.

Additional information

For more information about FLAG_SECURE, refer to Remote Viewing.