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Event Log Retention Settings
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On the General tab of each log s Properties dialog box (shown in Figure 12-1), you can specify the maximum size of the log and its behavior when the log reaches its maximum size. The available log retention options are as follows:
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Lesson 1
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Using Event Viewer
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Figure 12-1
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The General settings for the Security log
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Overwrite Events As Needed (default) The log erases the oldest individual entries as needed once the log file has reached the specified maximum size. Overwrite Events Older Than X Days The log retains all entries for the number of days (from 1 to 365) specified by this option and overwrites older entries as needed. If the log reaches its specified maximum size and there are no entries older than the number of days specified, the system stops writing new events to the log. Do Not Overwrite Events (Clear Log Manually) The system retains all log entries until an administrator manually erases them. Once the log reaches its specified maximum size, the system stops writing new events to the log.
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Leaving the default setting of Overwrite Events As Needed on the Security log could overwrite important resource access or other security-related data if the log is not checked often. A regular schedule of analysis is recommended. Log files can be archived (that is, saved to disk) if needed for record-keeping or other administrative purposes. For better assurance that no Security log entries have been lost, Windows Server 2003 Group Policy provides a setting in the Computer Configuration Policy: Security Settings that will force a computer to shut down if it is unable to write to the Security log with audit information. This setting forces disciplined administrative practice if the Security log is set to be cleared manually; however, it leaves the server vulnerable to denial-of-service attacks. See Auditing Security Events Best practices at http://technet2.microsoft.com/WindowsServer/en/Library /5658fae8-985f-48cc-b1bf-bd47dc2109161033.mspx.
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Monitoring Microsoft Windows Server 2003
Using Filters
When you first start Event Viewer and select a log, the snap-in displays all of the events that are recorded in the selected log chronologically. Depending on the size of the log and the retention settings, the list could be extremely long. However, many of the event entries are of the Information type, which result from normal everyday activities. To locate specific entries in the list, you can modify its order by clicking one of the column headings, or you can limit the display of what appears in the log to focus on the important events by using the Filter command or the Find command. To implement a filter on a log in Event Viewer, from the View menu, select Filter to display the Filter tab of the event log s Properties dialog box, as shown in Figure 12-2. In this dialog box, you can specify the event types you want to display and select other event criteria to reduce the event list to a manageable size. To search for specific items in the event list, you can select Find from the View menu to display the Find dialog box, which supports similar criteria to the Filter command.
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Figure 12-2
Filter settings for the Security log
Accessing Remote Event Logs
As with many MMC snap-ins, you can use Event Viewer to view the logs on other computers running Microsoft Windows as well as the computer on which you are working. To perform this task, in the console tree, select the Event Viewer (Local) object and, from the Action menu, select Connect To Another Computer. In the Select Computer dialog box, specify the name of the computer for which you want to view the event logs and then click OK.
Lesson 1
Using Event Viewer
12-7
Archiving Event Logs
The Event Viewer snap-in can save logs to files in several formats, including tabdelimited text (.txt) files, comma-delimited (.csv) files, and an Event Log format with an .evt extension, which can be opened by the snap-in. When you save a log to a file, you have a permanent record of the entries, and you can safely clear the log. Archiving on a regular basis ensures that the log files never grow too large, causing entries to be lost.
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