Nmap scan specific udp port – Linux Hint
Open UDP port 123 on Windows Firewall (Network Time Protocol) March 25, 2007 by Dave Lawlor 1 Comment On my internet time post there seems to be a lot of questions based on the firewall questions. Akamai Security Advisory-NTP-Reflection-Attacks-v5 Feb 12, 2014 Solved: Different between port 123 (ntp) and 37 (timeserve TIME can operate over either TCP or UDP. When operating over TCP, a host connects to a server that supports the TIME protocol on TCP port 37. The server then sends the time as a 32-bit unsigned binary number in network byte order representing a number of seconds since 00:00 (midnight) 1 January, 1900 GMT and closes the connection.
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Configure firewall to enable NTP port 123 on RHEL7 Linux Dec 18, 2016
Vulnerability Manager Appliance is unable to obtain time
UDP Port Scanner. With this online UDP port scanner you can scan an IP address for open UDP ports. Use this UDP port scan tool to check what services (dns, tftp, ntp, snmp, mdns, upnp) are running on your server, test if your firewall is working correctly, view open UDP ports. How to allow timesync over UDP port 123 (SNTP) and TCP Sep 14, 2009