Specifying a Basic NTP Configuration on a C Series Controller (C-Web Interface)
We recommend that you configure NTP on C Series Controllers.
To configure NTP to operate on a C Series Controller:
Click Configure, expand System, and then click NTP.
The NTP pane appears.
Click Create, enter information as described in the Help text in the main pane, and then click Apply.
If you do not configure a boot server, NTP cannot synchronize with a time server if the server’s time is very far off the local system’s time.