Fix Remote Desktop error: 'The required security package does not exist'

Issue

The "An authentication error has occurred. The required security package does not exist" error message appears when you connect to a Windows ECS instance by using Remote Desktop.

Cause

This error occurs because the required security package for Remote Desktop authentication is missing.

Solution

1. Connect to the Windows instance by using VNC.

2. Right-click the icon and click Run.

3. In the Run dialog box, enter gpedit.msc and click OK.

4. In the Local Group Policy Editor window, choose Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Security. Right-click Require user authentication for remote connections by using Network Level Authentication and select Edit.

5. In the Require user authentication for remote connections by using Network Level Authentication window, select Disabled and click OK.