A useful way to troubleshoot specific problems you are encountering with Active Directory is to increase the diagnostics logging level. Diagnostics logging can be enabled by component. For example, if you determine the KCC is not completing every 15 minutes, you can enable diagnostics logging for the one Knowledge Consistency Checker setting.

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After you enable auditing on a DHCP Server, all DHCP requests, database maintenance events, and various errors will be logged to a file. By default, a separate file is generated for each day of the week and stored in %SystemRoot%\system32\dhcp. The files are named DhcpSrvLog-xxx.log where xxx is the day of the week (e.g., DhcpSrvLog-Mon.log). After the first week, the previous week’s file is overwritten.

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