Event ID - 520

Event Id	520
Source	WDSServer
Description	Provider %1 did not close its registered endpoints during shutdown. There are %2 endpoints still open. Providers are required to releases all allocated resources when their shutdown callback function is called.
Event Information	According to Microsoft : Cause : This event is logged when provider did not close its registered endpoints during shutdown. Resolution : Examine the code or contact the vendor of the provider Custom providers must meet the requirements defined in the software development kit (SDK). To resolve this issue, examine the code to ensure that it meets these requirements, or contact the vendor for further support. Verify : To perform this procedure, you must either be a member of the local Domain Admins group or have been delegated the appropriate authority. To verify that the providers are working correctly: Open the Command Prompt window (Click Start , point to All Programs , click Accessories , and then click Command Promp t.) At the command prompt, run net stop wdsserver and then run net start wdsserver . Open Event Viewer (Click Start , type Event Viewer in the Start Search box, and then press ENTER .) In the left pane, expand Custom Views , expand Server Roles , and then click Windows Deployment Services . Click the Date and Time column heading to sort the events based on date and time. Ensure that you receive WDSServer event 517 for each of your providers (look in the event log message for each event, and make sure that each provider initializes.) Note : There are five providers included with the default installation of Deployment Server: WDSPXE, BINLSVC, WDSIMGSRV, WDSMC, and WDSTFTP.
Reference Links	Event ID 520 from Source WDSServer

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