You can stop HP SMH from the HP-UX command line: /opt/hpsmh/lbin/hpsmh stop
This will not stop the mini-daemon smhstartd, but will stop the HP-UX Apache-based web server. The next time you contact HP SMH through http://hostname:2301, the HP-UX Apache-based web server will again start up on port 2381 (https). If autostart is configured, the HP-UX Apache-based web server times out automatically after 30 minutes (default setting).
For more information, go to the hpsmh(1m) manpage: man hpsmh.