Netboot services "greyed out"

Services and/or Sharing greyed out:

The Netboot or other service list items in Server Admin Computers & Services column may be dimmed ("grayed out"). Dimmed items cannot be administered in Server Admin.

Solution

   1. On the affected server, quit Server Admin.

   2. Delete the /var/servermgrd/ directory.

   3. In Terminal, execute this command:

      sudo launchctl stop com.apple.servermgrd

   4. Restart Server Admin.

Also, if Netboot still isn't working:

sudo killall mountd

sudo rm /var/db/mountdtab

sudo mountd