Exam SK0-005 topic 1 question 210 discussion

The most likely source of the issue in this scenario is that the system clock is off by more than five minutes. Kerberos is a network authentication protocol that relies on a shared secret between the client and server, as well as a trusted third-party server that provides authentication services. One of the requirements for proper functioning of Kerberos is that the clocks of the client, server, and third-party server must be synchronized within a certain tolerance. If the clocks are out of sync by more than five minutes, authentication requests will fail. Option A, a local firewall blocking authentication requests, is possible, but unlikely given that the server log has entries regarding Kerberos errors. Option B, users having expired passwords, would not result in Kerberos errors, but would result in authentication failure messages. Option D, the server having no access to the LDAP host, is possible, but unlikely given that the technician confirmed that the system is able to communicate over the network and is configured correctly.