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Contains events logged by the Active Directory directory service. The primary events relate to the Active Directory database and global catalogs. You ll find details on database consistency checks, online defragmentation, and updates. The default location is %SystemRoot%\System32\Config\NTDS.evt. Contains Domain Name System (DNS) queries, responses, and other DNS activities. You might also find details on activities that relate to DNS integration with Active Directory. The default location is %SystemRoot%\System32\Config\ DNSEvent.evt. Contains events logged by the File Replication Service, a service used to replicate Active Directory changes to other domain controllers. You ll find details on any important events that took place while a domain controller attempted to update other domain controllers. The default location is %SystemRoot%\System32\ Config\NtFrs.evt.
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By default, the logs are sized as appropriate for the type of system you are working with and its configuration. In a standard configuration of Windows Server 2003, most logs have a maximum size of 16 MB. This includes the DNS Server, System, and Application logs. Because they are less critical, the Directory Service and File Replication Service logs on domain controllers have a maximum size of 512 kilobytes (KB). Because the Security log is so important, it is usually configured with a maximum size of 128 MB. Primarily, this is to allow the server to record a complete security audit trail for situations in which the server is under attack and a large number of security events are generated. Windows Server 2003 logs are configured to overwrite old events as needed by default. So, when the log reaches its maximum size, the operating system overwrites old events with new events. This is different from Microsoft Windows NT. In Windows NT, the event logs were configured to overwrite only events that were older than 7 days. If desired, you can configure Windows Server 2003 logs in the same way. However, the problem with doing it that way is, when the maximum size is reached, events less than 7 days old can t be overwritten and the system will generate an error message telling you that such and such an event log is full each time it tries to write an event and you can quickly get to where there are dozens of these errors on-screen. Note
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The log configuration can be controlled through Group Policy as well. This means changes to Group Policy could in turn change the maximum log size and which action to take when the maximum log size is reached. For more information about Group Policy, see 38, Managing Group Policy.
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Part 4: Managing Windows Server 2003 Systems
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Accessing the Event Logs and Viewing Events
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You can view the event logs using Event Viewer, as shown in Figure 15-9. Event Viewer is a Microsoft Management Console (MMC) snap-in that can be started from the Administrative Tools menu or by typing eventvwr at the command line. The main view shows event logs by name and also displays the current size of each log. When you select the log you want to view in the left pane, the events recorded in the log are displayed in the right pane.
Part 4: Managing Windows Server 2003 Systems
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Figure 15-9. The main view in Event Viewer lists the available logs and shows their current size.
As Figure 15-10 shows, individual event entries provide an overview of the event that took place. Each event is recorded according to the date and time the event took place as well as the event type. For all the logs except Security, the event types are classified as Information, Warning, or Error. For the Security log, the event types are classified as Success Audit or Failure Audit. These event types have the following meanings:
Information
Generally relates to a successful action, such as the success of a service starting up. If you ve configured Alert logging, the alerts are also recorded with this event type to show they ve been triggered. Describes events that aren t critical but could be useful in preventing future system problems. Most warnings should be examined to determine whether a preventative measure should be taken. Indicates a fatal error or significant problem occurred, such as the failure of a service to start. All errors should be examined to determine what corrective measure should be taken to prevent the error from reoccurring. Describes an audited security event that completed as requested, such as when a user logs on or logs off successfully.
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