// REFERENCE

4771 — Kerberos pre-authentication failed

Log: Security Medium risk

Kerberos pre-authentication failed (the DC-side equivalent of 4625 for Kerberos). Many 4771 with failure code 0x18 (bad password) betray brute force against the domain.

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Original descriptions based on Microsoft's public documentation. IDs and fields may vary with the Windows version and the active audit policy.