An IT administrator attempts to join a ClearPass server to an Active Directory domain. They notice that the system clocks of the ClearPass server and the AD domain are not in sync. The ClearPass server is 10 minutes behind the AD domain. What will be the likely outcome of this attempt to join the domain?
Kerberos, the underlying protocol for Active Directory authentication, is extremely time-sensitive. To prevent 'replay attacks,' AD Domain Controllers strictly enforce a maximum clock skew of 5 minutes. If the ClearPass server's clock differs from the AD domain by 10 minutes, the Kerberos tickets will be considered invalid, and the domain join attempt will fail. Administrators must ensure both systems are synced to a reliable NTP source before joining.
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