PKU2U authentication using online identities must be prevented.

From Windows 8 Security Technical Implementation Guide

Part of PKU2U Online Identities Authentication

Associated with IA controls: ECSC-1

SV-48424r1_rule PKU2U authentication using online identities must be prevented.

Vulnerability discussion

PKU2U is a peer-to-peer authentication protocol. This setting prevents online identities from authenticating to domain-joined systems. Authentication will be centrally managed with Windows user accounts.

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Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Network Security: Allow PKU2U authentication requests to this computer to use online identities" to "Disabled".

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