The 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 enable NTP to pass through the firewall, using the graphical tool system-config-firewall, issue the following command as root: ~]# system-config-firewall.

19.15. Configure the Firewall to Allow Incoming NTP The 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. Check if the firewall is configured to allow incoming NTP traffic for clients using the graphical Firewall Configuration tool. Homepage | NTP NTP supports the current and previous release versions of Safari, Internet Explorer, Firefox, Chrome and Opera web browsers. If you are using an earlier version, your experience may be limited to the technical capabilities of your device platform and browser. pool.ntp.org: NTP Servers in Europe, europe.pool.ntp.org

9.9. ntp.conf and dhcp. If your /etc/ntp.conf is being automatically overwritten, this may be due to DHCP. Either run your dhcpd (dhcp server) with the dhcpd.conf option "option ntp-servers ;", or run your dhcpcd (dhcp client) with the -N arg to prevent ntp.conf from being rewritten at all.

When operating in symmetric modes (1 and 2), this field must contain the NTP port number PORT (123) assigned by the IANA. Since the client's source port is 123, when the server sends the response back it'll send it to port 123. Naturally, in order to be able to receive that response the client must allow incoming responses on port 123.

If this service is turned off, the time setting for local computers is not synchronized with a time service in the Windows domain or with an externally configured time service. Windows Server 2003 uses NTP. NTP runs on UDP port 123. The Windows 2000 version of this service uses Simple Network Time Protocol (SNTP). SNTP also runs on UDP port 123.

Network Time Server NTP Timer Server 6 Ethernet Ports for GPS Beidou GLONASS Galileo QZSS Description: NTP network time server is a time server based on NTP (v2, v3, v4)/SNTP protocol. NTP time server receives the GNSS satellite timing signal (supports for GPS, Beidou, GLONASS, Galileo, and QZSS) and transmits standard time information in the The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use.