To prevent replay attacks, the Kerberos protocol uses time stamps as part of its definition. The possible values for this Group Policy setting are:Ī user-defined number of minutes from 1 through 99,999 This policy setting is supported on versions of Windows that are designated in the Applies To list at the beginning of this topic. Selecting this option does not change current computer time settings. Beginning with Windows Server 2008 and Windows Vista, you can persist changes if you select the option Define this policy in the database. If you configure this setting and then restart the computer, this setting reverts to the default value.
If the difference between a client computer clock and the domain controller clock is less than the maximum time difference that is specified in this policy, any time stamp that is used in a session between the two computers is considered to be authentic.Ĭhanges to this setting are not persistent on computers running Windows Server 2003 and Windows XP. Because the clocks of two computers are often out of sync, administrators can use this policy setting to establish the maximum acceptable difference to the Kerberos protocol between a client clock and domain controller clock. In other words, both computers must be set to the same time and date. For time stamps to work properly, the clocks of the client and the domain controller need to be in sync as much as possible. To prevent "replay attacks," the Kerberos v5 protocol uses time stamps as part of its protocol definition.
This security setting determines the maximum time difference (in minutes) that Kerberos V5 tolerates between the time on the client clock and the time on the domain controller that provides Kerberos authentication.
#Cfx manager protocol maximum time professional
This security policy reference topic for the IT professional describes the best practices, location, values, policy management, and security considerations for this policy setting. Applies To: Windows Server 2008, Windows 8.1, Windows Server 2008 R2, Windows Server 2012 R2