Policy
Allow delegating default credentials with NTLM-only server authentication
Microsoft Windows
Policy overview
Key metadata and intent for this policy.
Supported OS tags: Windows10, Windows10RT, Windows11, Windows7, Windows8, Windows81, WindowsRT, WindowsRT81, WindowsServer2008, WindowsServer2012, WindowsServer2012R2, WindowsServer2016, WindowsVista
This policy setting applies to applications using the Cred SSP component (for example: Remote Desktop Connection). This policy setting applies when server authentication was achieved via NTLM. If you enable this policy setting, you can specify the servers to which the user's default credentials can be delegated (default credentials are those that you use when first logging on to Windows). If you disable or do not configure (by default) this policy setting, delegation of default credentials is not permitted to any machine. Note: The "Allow delegating default credentials with NTLM-only server authentication" policy setting can be set to one or more Service Principal Names (SPNs). The SPN represents the target server to which the user credentials can be delegated. The use of a single wildcard character is permitted when specifying the SPN. For Example: TERMSRV/host.humanresources.fabrikam.com Remote Desktop Session Host running on host.humanresources.fabrikam.com machine TERMSRV/* Remote Desktop Session Host running on all machines. TERMSRV/*.humanresources.fabrikam.com Remote Desktop Session Host running on all machines in .humanresources.fabrikam.com
Registry values
How enabled and disabled states update the registry.
| Scope | Registry location | Type | Enabled value | Disabled value | Copy |
|---|---|---|---|---|---|
| Computer | Path Software\Policies\Microsoft\Windows\CredentialsDelegation Value name AllowDefCredentialsWhenNTLMOnly | REG_DWORD | HKLM 1 | HKLM 0 |
Policy elements
Inputs and configuration options exposed by this policy.
| Scope | Element | Type | Registry mapping | Constraints & behavior | Copy |
|---|---|---|---|---|---|
| Computer | Concatenate OS defaults with input above ID ConcatenateDefaults_ADCN | boolean | Path Software\Policies\Microsoft\Windows\CredentialsDelegation Value name ConcatenateDefaults_AllowDefNTLMOnly Type REG_DWORD | Options: true (1), false (0) True: Set value = 1 · False: Set value = 0 | |
| Computer | Add servers to the list: ID AllowDefCredentialsWhenNTLMOnly_Name | list | Path Software\Policies\Microsoft\Windows\CredentialsDelegation\AllowDefCredentialsWhenNTLMOnly Value name AllowDefCredentialsWhenNTLMOnly Type REG_MULTI_SZ | List: additive |