The service principal name (SPN) target name validation level will be turned off.

From Windows Server 2008 R2 Domain Controller Security Technical Implementation Guide

Part of SPN Target Name Validation Level

Associated with IA controls: ECSC-1

SV-32441r1_rule The service principal name (SPN) target name validation level will be turned off.

Vulnerability discussion

If a service principle name (SPN) is provided by the client, it is validated against the server’s list of SPNs. This setting can cause disruptions in file and printer services.

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Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Microsoft Network Server: Server SPN target name validation level” to “Off”.

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