Event ID - 101

Event Id101
SourceWUSyncService
DescriptionSoftware Update Services encountered a failure during synchronization. View the synchronization log on this server for details of what failed during synchronization. To view the synchronization log, go to the Software Update Services Admin Web site (http://<YourServerName>/SUSAdmin), and click the View synchronization log link. (Error <error code>: <error description>) User Action Try synchronizing the server again to see if the error occurs again. To synchronize the server, go to the Software Update Services Admin Web site, and click the Synchronize server link. Then click the Synchronize Now button. Additional Data The most common reason for failed synchronization is incorrect proxy server configuration. If you are using a proxy server, please confirm your configuration by going to the Software Update services Admin Web site and clicking the Set options link. Confirm your configuration in the results pane. For troubleshooting information, see the Microsoft Software Update Services Deployment Guide (http://go.microsoft.com/fwlink/?LinkId=6928).
Event InformationUser Action:
Try synchronizing the server again to see if the error occurs again. To synchronize the server, go to the Software Update Services Admin Web site, and click the Synchronize server link. Then click the Synchronize Now button.

Additional Data:
The most common reason for failed synchronization is incorrect proxy server configuration. If you are using a proxy server, please confirm your configuration by going to the Software Update Services Admin Web site and clicking the Set options link. Confirm your configuration in the results pane.
Reference LinksSUS xmlhttp failure when clicking on syncronize now

SUS server fails to synchronize with Windows Update servers

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