WSUS and SUP

The first component in software updates is WSUS. WSUS is significant because it acquires all information about available updates and distributes that catalog of updates to clients. Luckily, ConfigMgr takes over control of WSUS by using a SUP, and creates detailed log files of the WSUS operation. Here are the three main log files for WSUS and an SUP, located in <ConfigMgrInstallPath>\Logs:

WCM.log: Provides information about the software update point configuration and connecting to the WSUS server for subscribed update categories, classifications, and languages.

WSUSCtrl.log: Provides information about the configuration, database connectivity, and health of the WSUS server for the site.

wsyncmgr.log: Provides information about ...

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