Cisco Cisco Firepower Management Center 4000

To receive time through NTP from a different server, select 

 and, in the text box, type a 

comma-separated list of IP addresses for the NTP servers you want to use or, if DNS is enabled, type 
the fully qualified host and domain names.

If the appliance is rebooted and your DHCP server sets an NTP server record different than the one you 
specify here, the DHCP-provided NTP server will be used instead. To avoid this situation, configure your 
DHCP server to set the same NTP server.

You have the following options for specifying how time is synchronized on any managed devices:

Select 

to set the time manually. See 

 for information about setting the time after you apply the system policy.

Select 

Defense Center to receive time through NTP from the Defense Center. See 

 for more information.

Select 

 to receive time through NTP from different servers. In the text box, type a 

comma-separated list of IP addresses of the NTP servers or, if DNS is enabled, type the fully 
qualified host and domain names.

It may take a few minutes for the managed device to synchronize with the configured NTP 
servers. In addition, if you are synchronizing the managed device to a Defense Center that is 
configured as an NTP server, and the Defense Center itself is configured to use an NTP server, 
it may take some time for the time to synchronize. This is because the Defense Center must first 
synchronize with its configured NTP server before it can serve time to the managed device.

Click 

.

The system policy is updated. Your changes do not take effect until you apply the system policy. See 

 for more information.

Any

You can configure the Defense Center as a time server using NTP and then use it to synchronize time 
between the Defense Center and managed devices. 

Note that you cannot set the time manually after configuring the Defense Center to serve time using NTP. 
If you need to manually change the time, you should do so before configuring the Defense Center to 
serve time using NTP. If you need to change the time manually after configuring the Defense Center as 
an NTP server, disable the 

 option and click 

, change the time manually and click 

, and 

then enable 

 and click 

.

If you configure the Defense Center to serve time using NTP, and then later disable it, the NTP service 
on managed devices still attempts to synchronize time with the Defense Center. You must disable NTP 
from the managed devices’ web interfaces to stop the synchronization attempts.

Admin