In K1000 appliance version 5.1, navigate to: Settings > Control Panel > Date & Time Settings
Click on Edit Mode and change the Time Server to a NTP server other than "time.kace.com".
This can be a time server off of the local network or one off of the Internet. This is because "time.kace.com" does not exist and is there as an example of a NTP server.
Public NTP servers can be found here.