Windows System Event: 521

Active Directory Auditing Tool

The Who, Where and When information is very important for an administrator to have complete knowledge of all activities that occur on their Active Directory. This helps them identify any desired / undesired activity happening. ADAudit Plus assists an administrator with this information in the form of reports. In real-time, ensure critical resources in the network like the Domain Controllers are audited, monitored and reported with the entire information on AD objects - Users, Groups, GPO, Computer, OU, DNS, AD Schema and Configuration changes with 200+ detailed event specific GUI reports and email alerts.

System Event » Windows System Event: 521

Event ID 521: Unable to log events to security log.

Description This event is logged if Windows was unable to write events to the Security event log.
Category System

The event logs the following information:

Status code The code for the reason of occurrence.
Value of CrashOnAuditFail Whether the system should halt when not able to write to security log. See event 4906 for possible values.
Number of failed audits The number of events affected.

Pro tips:

  • ADAudit Plus monitors this event in real time, so that you may be notified as soon as the system is unable to log security events.
  • The event can be viewed as a report that represents when the event occurred, and on which domain controller the problem arose.
  • Since it is a critical security event, administrators can be alerted via E-mail or SMS as soon as this event is logged.

Event 521 applies to the following operating systems:

  • Windows server 2000
  • Windows server 2003 and XP