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Use Samsung DeX during a remote session

Samsung DeX is a feature that extends a Samsung mobile device's interface to PC peripherals. With it, users can enjoy their Galaxy device on a desktop computer or connected to a display with a mouse and keyboard.

If your enterprise manages Samsung devices, you can employ Knox Remote Support and Samsung DeX mode in tandem. The user can put the device in DeX mode prior to starting the remote session. When the support specialist connects to the device using the Knox Remote Support Viewer, they are offered a desktop-like environment with mouse and keyboard support, which enhances their productivity during the remote session.

Supported devices

You can combine a remote session with DeX mode on the following devices:

Device Android version

Galaxy S series, S8 or later

Galaxy Tab series, S7 or later

Galaxy Tab Active Pro

Galaxy Tab Active3

13 or higher

For details about the desktop environments, peripherals, and interfaces that are compatible with Samsung DeX, see The beginner's guide to Samsung DeX on Samsung Insights.

Prepare the device profile for DeX mode

If the device is managed by an EMM, in order for Knox Remote Support to tunnel through DeX mode, the EMM must first grant Device Admin (DA) permissions to the Knox Remote Support agent.

If the device's EMM is from a third party, then you must push the relevant policy that grants DA permissions to apps.

If the device's EMM is Knox Manage, then you can configure a Knox Service Plugin policy to grant DA permissions to the agent. To configure that Knox Service Plugin policy:

  1. On the Knox Manage console, go to Profile, then click the name of the device's profile.
  2. Click Modify Policy.
  3. Under Samsung Knox > Knox Service Plugin > Device-wide policies... > Device Admin allowlisting, set the following policies:

    • Enable device admin controlsTrue
    • Allowlisted DAs — Add an admin named Knox Remote Support
  4. Save & Apply the policy.

Start a remote session in DeX mode

First, the device user must enter DeX mode and launch Knox Remote Support:

  1. Connect the mobile device to a desktop computer or peripheral combination. For help with this step, see Tips for getting started with Samsung DeX in The beginner's guide to Samsung DeX.
  2. Enter DeX mode.
  3. In the DeX interface, open Knox Remote Support.
  4. Click Start now when prompted to begin recording or casting.

The device is now ready to begin a remote support session. Initiating the session flows like regular Knox Remote Session experience.

To request a session, the support specialist must:

  1. Access the Knox Remote Support Viewer.
  2. Deliver the 6-digit access code to the device user.

To begin the session, the device user must:

  1. In the DeX interface, enter the 6-digit access code in the Knox Remote Support agent.
  2. If this is their first time accessing the Knox Remote Support agent in DeX mode, they must agree to provide Device Admin permissions to the agent.

The support specialist is now remotely connected to the device in DeX mode.

End a remote session in DeX mode

There are two methods of ending a remote session while in DeX mode:

  • In the Knox Remote Support Viewer, the support specialist clicks Disconnect.
  • In the DeX interface, the device user exits DeX mode.

Knox Remote Support Viewer and DeX mode

During a remote session in DeX mode, the following buttons are disabled in the Knox Remote Support Viewer:

The interface of the Knox Remote Support Viewer, with the Power and Rotate buttons disabled.

  • Power — If the device resets or turns off, it will exit DeX mode and won't restart DeX mode on boot. The action is therefore disabled to prevent severe disruptions to the remote session.
  • Rotate — Unlike mobile displays, external displays don't physically rotate during regular use, so the action is disabled.

Troubleshoot Knox license activation errors

With certain Samasung device models, when the device first enters DeX mode, it prompts the user to agree to the Knox license.

A prompt asking to agree to the Knox license.

In some rare cases, agreeing to the license produces an RSA error.

The error that appears after agreeing to the Knox license.

Asking the Knox Remote Support agent to proceed typically resolves the issue.

The error resolving after the device user proceeds.

See also