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Testing my routers firewall today and it seems whenever it's set to optain time automatically, port 123 is closed (a.k.a. actively responding to requests) instead of NOT responing to requests. I'm pretty sure it's not supposed to do that.
Hi,
Port 123 are the service ports of NTP server, while as a client regarding to NTP server, we won't open them.
We did several experiments based on your feedback, there is no response by sending a UDP message to 123 and the Syn of TCP, so it should be safe at the moment.
Also please tell us what the scanning tools you used for this test are and whether it is convenient to provide them to us.
On our side, we need evaluate the criteria for judging this scanning tool.
Good day.
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