| Event Id | 506 |
| Source | Windows Server Update Services |
| Description | The SelfUpdate Tree is not working. Clients may not be able to update to the latest WUA client software and communicate with the WSUS Server. |
| Event Information | According to Microsoft: This reason for such behavior is, If you change the properties of the Automatic Updates service (via Group Policy - Computer Configuration, Windows Settings, Security Settings, System Services) to set it as Disabled or edited the Access Control, ACL on Automatic Update Client (WUAUSERV) service. This behavior occurs because of a race condition. In Windows Server 2003, BITS depends on the EventSystem service. Therefore, if BITS starts before the EventSystem service starts, BITS tries to start the EventSystem service and then waits until the EventSystem service starts. However, even after the timeout period (typically, 80 seconds), if the EventSystem service does not start, the Service Control Manager (SCM) causes BITS to timeout and then adds a message in the event log. Then, you receive the "At least one of services failed to start" error message in the SCM that is mentioned in the "Symptoms" section. After you receive this error message, the EventSystem service may start, and BITS may enter the "Running" state. Because of this behavior, startup may take longer (typically, two minutes more) than usual. |
| Reference Links | Startup may take longer than usual and you may receive an "At least one of services failed to start" error message The Automatic Updates Service starts and then stops automatically WSUS: Script to delete duplicate SID created by Disk Imaging / Disk Cloning Windows Server Update Services (WSUS) Deploying Microsoft Windows Server Update Services(Tool) Windows Server Update Services Downloads Automatic Updates must be updated |
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