A word of warning to anyone else who remotely administers Macs. The 3.7.0 ARD update that dropped alongside Mavericks screws up ARD's ability to communicate with ARD Client through OSX's built-in firewall. Even if you have everything configured properly, it'll block it anyway. Makes Macs that upgrade from ARD Client 3.6.2 to ARD 3.7.0 unreachable unless you completely turn off the firewall. Haven't found a workaround yet that doesn't involve the firewall being turned off. This is under 10.8.5 Mountain Lion. I'll be updating one of the machines to Mavericks shortly; I doubt that will change ARD's behavior, but we'll see.