This issue occurs because the WSUS application pool in IIS “WsusPool” has reached it’s maximum private memory limit and attempts to recycle the memory usage. WSUS 503 Error: Connection Error The Problem You will also see the below error message when attempting to use the WSUS MMC. : The remote server returned an error: (503) Server Unavailable.Īt ()Īt .HmtWebServices.CheckContentDirWebAccess(EventLoggingType type, HealthEventLogger logger) Event ID: 12072 - Windows Server Update Servicesĭescription: The WSUS content directory is not accessible.Event ID: 12052 - Windows Server Update Servicesĭescription: The DSS Authentication Web Service is not working.Event ID: 12042 - Windows Server Update Servicesĭescription: The SimpleAuth Web Service is not working.Event ID: 12022 - Windows Server Update Servicesĭescription: The Client Web Service is not working.Event ID: 12032 - Windows Server Update Servicesĭescription: The Server Synchronization Web Service is not working.Event ID: 12012 - Windows Server Update Servicesĭescription: The API Remoting Web Service is not working.Event ID: 12002 - Windows Server Update Servicesĭescription: The Reporting Web Service is not working.Event ID: 13042 - Windows Server Update Services.Looking at the server event log, you’ll notice multiple application errors: When the issue occurs, all processes will appear to be running on the server. One would have thought they would have resolved this issue on a new server operating system.

Before realizing what the issue was, I attempted to re-install WSUS and IIS from scratch numerous times until I came across old notes. Recently, I deployed Windows Server Update Services on a new Windows Server 2019 – Server Core install, and experienced this issue during the first synchronization. I originally experienced this on Windows Server Update Services running on Windows Server 2012 R2 and applied the fix. On a fresh or existing WSUS install, you may notice that the WSUS Administrator MMC applet stops functioning and present the error “Error: Connection Error – An error occurred trying to connect to the WSUS Server.”

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