GPO policy: "Require use of specific security layer for remote (RDP) connections" under Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Security. Controls the security/transport layer used for RDP client connections. Registry: HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services:SecurityLayer (REG_DWORD). CIS Benchmark (L1) recommends SSL/TLS (value 2) for strong server authentication. If SSL is selected, NLA can be enforced separately via the "Require NLA" policy. Reference: Policy CSP - ADMX_TerminalServer
Values
| Enum Value | Description |
|---|---|
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RDP Security Layer (registry value 0). Native RDP encryption is used for the session; no SSL/TLS server authentication. Provides minimal protection; not recommended. |
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Negotiate (registry value 1). The most secure layer supported by the client is negotiated; SSL/TLS is preferred if the client supports it, otherwise RDP encryption is used. |
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SSL/TLS (registry value 2). SSL (TLS 1.0 or higher) is required for server authentication and to encrypt all data transferred during the session. CIS L1 recommended value. |
Used by
ComputerAdministrativeTemplatestype: Computer-specific Administrative Templates (ADMX) settings on an Endpoint.
Example
Example
"RDP"