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Domain member: Digitally encrypt or sign secure channel data (always)

Updated: January 21, 2005

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Domain member: Digitally encrypt or sign secure channel data (always)

Description

This security setting determines whether all secure channel traffic initiated by the domain member must be signed or encrypted.

When a computer joins a domain, a computer account is created. After that, when the system starts, it uses the computer account password to create a secure channel with a domain controller for its domain. This secure channel is used to perform operations such as NTLM pass through authentication, LSA SID\Name Lookup etc.

This setting determines whether or not all secure channel traffic initiated by the domain member meets minimum security requirements. Specifically it determines whether all secure channel traffic initiated by the domain member must be signed or encrypted. If this policy is enabled, then the secure channel will not be established unless either signing or encryption of all secure channel traffic is negotiated. If this policy is disabled, then encryption and signing of all secure channel traffic is negotiated with the Domain Controller in which case the level of signing and encryption depends on the version of the Domain Controller and the settings of the following two policies:

  • Domain member: Digitally encrypt secure channel data (when possible)

  • Domain member: Digitally sign secure channel data (when possible)

Default: Enabled.

Configuring this security setting

You can configure this security setting by opening the appropriate policy and expanding the console tree as such: Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\

For specific instructions about how to configure security policy settings, see Edit security settings on a Group Policy object.

Important

  • In order to take advantage of this policy on member workstations and servers, all domain controllers that constitute the member’s domain must be running Windows NT 4.0 Service Pack 6 or higher.

  • In order to take advantage of this policy on domain controllers, All domain controllers in the same domain, as well as all trusted domains, must be running Windows NT 4.0 Service Pack 6 or higher.

Notes

  • If this policy is enabled, the policy Domain member: Digitally sign secure channel data (when possible) is assumed to be enabled regardless of its current setting. This ensures that the domain member attempts to negotiate at least signing of the secure channel traffic.

  • If this policy is enabled, the policy Domain member: Digitally sign secure channel data (when possible) is assumed to be enabled regardless of its current setting. This ensures that the domain member attempts to negotiate at least signing of the secure channel traffic.

  • Logon information transmitted over the secure channel is always encrypted regardless of whether encryption of ALL other secure channel traffic is negotiated or not.

For more information, see:

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