I am fairly sure executing the post-install event will reset all major SME services based on the configuration dbase:
signal-event post-install
You could also access the SME Console and run through the "Configure this Server" option. You will likely need to change something so that the configuration utility will identify that you want it to reconfigure your server. I would suggest enabling/disabling DHCP, saving setting, then running through the Configure this Server utility again and reset your DHCP settings.