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Event ID 3024: Server … failed to validate DDR certificate for original address … with status

Windows Event ID Lookup: What Windows event IDs mean: 4625, 4624, 4740, 6008, 41, 7045, 1102 and 3,000 more, with Windows' own message text, the fields and what to check.

Look up a Windows event ID from Event Viewer, a SIEM alert or a log export: what it means, the fields it records, and what to check. Many IDs are used by more than one source (event 41 is both a Kernel-Power crash and a boot error), so every definition is shown, the one people usually mean first. The message text is Windows' own, read from the event providers of Windows 10.0.26200.0, 2026-10-28; the notes are ours, based on Microsoft's security auditing reference.

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Server … failed to validate DDR certificate for original address … with status

Event 3024
DNS-Client
System log
Warning
Message and fields (as Event Viewer shows them)
Server … failed to validate DDR certificate for original address … with status …

The SMB server observed that the client did not send an SPN during authentication, indicating that the client does not support Extended Protection for Authentication (EPA) or that support for EPA is disabled.

Event 3024
SMBServer
SMBServer/Operational log
Information
Message and fields (as Event Viewer shows them)
The SMB server observed that the client did not send an SPN during authentication, indicating that the client does not support Extended Protection for Authentication (EPA) or that support for EPA is disabled.

Client name: …
SPN Query Status: …
SPN Validation Policy: …