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Event ID 1104: The security log is now full

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.

Try: 4625, 4624, 4740, 6008, 41, 1074, 7045, 1102, 4104, 1149

The security log is now full.

Event 1104
Eventlog
Security / System log
Error
Message and fields (as Event Viewer shows them) 
The security log is now full.

Encryption Provider initialization failed.

Event 1104
Winlogon
System log
Warning
Message and fields (as Event Viewer shows them) 
Encryption Provider initialization failed. Error …

Windows was unable to read the Windows Management Instrumentation (WMI) filter information associated with the Group Policy object ….This may be caused by a deleted WMI Filter defined in the domain that is still in use by Group Policy objects.

Event 1104
GroupPolicy
System log
Warning
Message and fields (as Event Viewer shows them) 
Windows was unable to read the Windows Management Instrumentation (WMI) filter information associated with the Group Policy object ….This may be caused by a deleted WMI Filter defined in the domain that is still in use by Group Policy objects. Group Policy settings for this Group Policy object will not be enforced. Other Group Policy objects may still apply. Windows will attempt to retrieve this information at the next policy cycle. This specific problem may be resolved by identifying all GPOs that reference the WMI filter and removing the references. Contact an administrator if this event recurs for several hours.