The computer clock synchronization tolerance must meet minimum standards.

From Windows Server 2008 R2 Domain Controller Security Technical Implementation Guide

Associated with IA controls: ECSC-1

SV-36186r1_rule The computer clock synchronization tolerance must meet minimum standards.

Vulnerability discussion

This setting determines the maximum time difference (in minutes) that Kerberos will tolerate between the time on a client's clock and the time on a server's clock while still considering the two clocks synchronous. In order to prevent replay attacks, Kerberos uses timestamps as part of its protocol definition. For timestamps to work properly, the clocks of the client and the server need to be in sync as much as possible.

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Configure the Kerberos policy option Maximum tolerance for computer clock synchronization to a maximum of 5 minutes or less.

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