Windows Process Activation Service encountered an error trying to track worker process '%1' that belongs to app pool '%2'. ...

Windows Process Activation Service encountered an error trying to track worker process '%1' that belongs to app pool '%2'. This will result in this worker process not showing up in global queries enumerating all worker processes.  It will also disable clients from being able to directly create a WORKER_PROCESS object to monitor this worker process.  A client can see find this worker process by querying all worker processes in the app pool that this process belongs to.  The data field contains the error number.