Kerberos pre-authentication failure can occur due to a variety of reasons, including:
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Incorrect password: Kerberos needs to verify the users password first. If the user enters an incorrect password, pre-authentication failure can occur.
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Clock skew: Kerberos protocol uses clock synchronization to ensure the correctness of tickets. If there is a significant time difference between the client computer and the domain controller, pre-authentication failure may occur.
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Account lockout: If incorrect passwords are repeatedly used for login attempts, it can lead to the account being locked out, which can cause pre-authentication failure.
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Security settings: Sometimes, security settings can prevent certain aspects of the Kerberos authentication process, such as password policies, account lockout policies, etc.
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Malicious attack: Attackers may try to interfere with the Kerberos authentication process using brute force attacks or malware, leading to pre-authentication failure.
Other reasons for Kerberos pre-authentication failure may include issues with the clients network connection or configuration, issues with the domain controllers configuration, or issues with the Kerberos configuration itself.
To troubleshoot Kerberos pre-authentication failure, it is important to investigate the error message and the corresponding event logs on the client computer and the domain controller. This can help identify the root cause of the issue and determine the appropriate remediation steps.