Already there in /etc/services file. ntp 123/tcp # Network Time Protocol ntp 123/udp # Network Time Protocol Thanks, Venkat Paul.Croome at softwareag.com wrote: > See https://ntp.isc.org/bin/view/Support/SelectingOffsiteNTPServers. > > You may need to make in hole in your firewall for port 123 UDP. > > Paul