Executing netstat -aon | find "8005"
showed a process listening on port 8005 and the process PID.
showed the process PID was tomcat5.exe.
Tomcat listens on port 8005 for the shutdown command.
In Services MMC it was noted IBMStorageManagerProfiler Server had been installed and had installed its own IBM Tomcat server service.
Shutting down the IBM Tomcat server allows the Vontu Manager service to start, with successful login to the Enforce UI.