If you want to still be able to access the e-smith web server from the local network, but not be able to access it from the Internet:
/sbin/e-smith/db configuration setprop httpd-e-smith access private
/sbin/e-smith/signal-event post-upgrade
/sbin/e-smith/signal-event reboot
Or, if you just want to kill of the web server on port 80 completely -- as in, not running at all:
/sbin/e-smith/db configuration setprop httpd-e-smith status disabled
/sbin/e-smith/signal-event post-upgrade
/sbin/e-smith/signal-event reboot
Be advised that if you've linked any custom startup scripts into /etc/rc.d/rc7.d that they will be blown away by the post-upgrade event. Either relocate them (just the custom ones) prior to post-upgrade and restore them before the reboot, or just recreate them after the post-upgrade and then reboot.
Scott