Event ID 306: Export of supplemental credentials attempted

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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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Export of supplemental credentials attempted.

Event 306

Security-Kerberos

System log

Error

Message and fields (as Event Viewer shows them)

Export of supplemental credentials attempted. This is unsupported with Credential Guard.

Process Name:…
Service Host Tag:…

For Task Scheduler Task Engine "…" , the thread pool failed to process the message.

Event 306

TaskScheduler

TaskScheduler/Operational log

Error

Message and fields (as Event Viewer shows them)

For Task Scheduler Task Engine "…" , the thread pool failed to process the message. Additional Data: Error Value: ….

The BITS service loaded the job list from disk.

Event 306

Bits-Client

Bits-Client/Operational log

Verbose

Message and fields (as Event Viewer shows them)

The BITS service loaded the job list from disk.