NTP traffic consists of
UDP packets on port
123 and needs to be permitted through network and host-based firewalls in order for
NTP to function.
22.14.1. Configure the Firewall Using the Graphical Tool
to pass through the firewall, using the graphical tool system-config-firewall
, issue the following command as root:
The Firewall Configuration
window opens. Select Other Ports
from the list on the left. Click . The Port and Protocol
window opens. Click on one of the port numbers and start typing
. Select the “port 123”
entry with udp
as the protocol. Click . The Port and Protocol
window closes. Click in the Firewall Configuration
window to apply the changes. A dialog box will pop up to ask you to confirm the action, click . Note that any existing sessions will be terminated when you click .