Policy

Allow delegating default credentials with NTLM-only server authentication

Windows 11 25H2

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Policy overview

Key metadata and intent for this policy.

ClassComputer
CategorySystem > Credentials Delegation
Supported onAt least Windows Vista

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

Internal name
AllowDefCredentialsWhenNTLMOnly
Policy ID
5c2ca9a2024c
Elements
2

Registry values

How enabled and disabled states update the registry.

Registry locationTypeEnabled valueDisabled value
HKLM\Software\Policies\Microsoft\Windows\CredentialsDelegation\AllowDefCredentialsWhenNTLMOnlyREG_DWORD
1
0

Policy elements

Inputs and configuration options exposed by this policy.

ElementTypeRegistry mappingConstraints & behavior
Concatenate OS defaults with input above
ID ConcatenateDefaults_ADCN
boolean
HKLM\Software\Policies\Microsoft\Windows\CredentialsDelegation\ConcatenateDefaults_AllowDefNTLMOnly
Type REG_DWORD
Options: true (1), false (0)
True: Set value = 1 · False: Set value = 0
Add servers to the list:
ID AllowDefCredentialsWhenNTLMOnly_Name
list
HKLM\Software\Policies\Microsoft\Windows\CredentialsDelegation\AllowDefCredentialsWhenNTLMOnly\AllowDefCredentialsWhenNTLMOnly
Type REG_MULTI_SZ
List: additive

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