SCCM SUP WSUS Pool keeps stopping or the server is unresponsive Scenario: Our WSUS/SUP had become unresponsive and the decision to reinstall the server role was made. After the Site server had been reinstalled I became aware that Windows Defender updates were failing to update (3 days old) and even though the updates were sync'd, downloaded, and deployed in SCCM the client was still unable to receive them. Client Log analysis : ScanAgent.log ScanJob({999C9FFA-A463-4BE8-8771-67EE96D4140B}): CScanJob::OnScanComplete -Scan Failed with Error=0x80240440 ScanJob({999C9FFA-A463-4BE8-8771-67EE96D4140B}): CScanJobManager::OnScanComplete- failed at CScanJob::OnScanComplete with error=0x80240440 Update Deployment.log Job error (0x80240440) received for assignment ({bf7a48e6-d220-4070-bb9b-ecc239107584}) action UpdatesDeploymentAgent Updates will not be made available WUAHandle...