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A comment on Challenge HN: There's only one truly open port on this machine. Can you find it?.

Re:Challenge HN: There's only one truly open port on this ma... by Theurgius on Tuesday December 26, 2023 @03:52PM (#38775942)
Running a quick nmap shows all ports as open, yet i tried to connect to some manually to no avail. Is there a better way to to automatically test all of them?
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Re:Challenge HN: There's only one truly open port on this ma... by stop50 on Tuesday December 26, 2023 @04:02PM (#38776037)
I would look at the nmap doc, there are tests that connect to the port.
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Re:Challenge HN: There's only one truly open port on this ma... by edm0nd on Tuesday December 26, 2023 @05:48PM (#38776933)
likely part of the challenge. has some kind of ids/ips that reports all ports as open.
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Re:Challenge HN: There's only one truly open port on this ma... by ksaj on Tuesday December 26, 2023 @07:37PM (#38777682)
That's the point of this post. Look at the packet headers for each return packet. Look for a difference in TTL, for example.
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Re:Challenge HN: There's only one truly open port on this ma... by ActorNightly on Thursday December 28, 2023 @03:44AM (#38791383)
Be real careful about running nmap on public ips. ISPs can ban for that.
[ Parent | on HN ]