Event Details
Operating System->Microsoft Windows->Built-in logs->Windows 2008 or higher->Security Log->110X - Non Audit (EventLog)->Event processing->EventID 1104 - The security log is now full.
EventID 1104 - The security log is now full.
This event indicates than no more event can be written to the log until it will be cleared up, rotated or log size will be increased.

Note:
If the log is set to Overwrite events as required (retention is set to false on the command line), the log automatically recovers from the log full condition by overwriting the oldest events with new events.
If the log is set to Archive the log when full, do not overwrite events (retention is set to true, autoBackup is set to true from the command line), the log automatically recovers from the log full condition by copying the full log into a file with the file name based on the date that the file was created.
If the log is set to Do not overwrite events (retention is set to true, autoBackup is set to false from the command line), the log must manually be cleared from the command line. To do this, right-click the log entry in the Event Viewer and select Clear Log, or by running the following command from a command prompt that is run with administrator privileges (right-click the command prompt executable and run it by selecting Run as administrator)

The proper response action for this event should be the automatic log backup (EventID 1105) or immediate system shutdown.

Find more information about this event on ultimatewindowssecurity.com.
 Sample:
        The security log is now full.
      
Log Type: Windows Event Log
 Uniquely Identified By:
Log Name: Security
Filtering Field Equals to Value
OSVersion Windows Vista (2008)
Windows 7 (2008 R2)
Windows 8 (2012)
Windows 8.1 (2012 R2)
Windows 10 (2016)
Source Microsoft-Windows-Eventlog
TaskCategory Event Processing
EventId 1104
Field Matching
FieldDescriptionStored inSample Value
DateTime Date/Time of event origination in GMT format. DateTime 10.10.2000 19:00:00
Source Name of an Application or System Service originating the event. Source Security
Type Warning, Information, Error, Success, Failure, etc. Type Success
User Domain\Account name of user/service/computer initiating event. User RESEARCH\Alebovsky
Computer Name of server workstation where event was logged. Computer DC1
EventID Numerical ID of event. Unique within one Event Source. EventId 576
Description The entire unparsed event message. Description Special privileges assigned to new logon.
Log Name The name of the event log (e.g. Application, Security, System, etc.) LogName Security
Task Category A name for a subclass of events within the same Event Source. TaskCategory
Level Warning, Information, Error, etc. Level
Keywords Audit Success, Audit Failure, Classic, Connection etc. Keywords
Category A name for an aggergative event class, corresponding to the similar ones present in Windows 2003 version. Category Account Logon
Object Name -
Whom -
Object Type -
Class Name -
Security ID -
Account Name -
Account Domain -
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