Each service run on your Windows computer uses a port. A port is an allocated space for your computer to communicate with other computers on the network. Your Windows Firewall controls what ports are accessible to eliminate the possibility of malicious connections to your computer. To use the Network Time Protocol (NTP), you must open port number 123 on your Windows Firewall. This allows your computer to synchronize with the NTP server on the network.
Click the Windows "Start" button and select "Control Panel." Click "Security" and then click "Windows Firewall." This opens a configuration window for the firewall software.
Click "Allow a program through Windows Firewall." This opens another configuration window. Click "Add Port" to specify a new port setting.
Type a name for the firewall configuration, such as "NTP Port." Type "123" in the port number text box and then select "UDP" in the protocol drop-down box. Click "Change scope" to save the new port settings.
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