Timeline for Nmap - Closed vs Filtered
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| S Jun 22, 2021 at 18:11 | history | suggested | Matthias Braun | CC BY-SA 4.0 |
spelling, add link
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| Jun 22, 2021 at 9:37 | review | Suggested edits | |||
| S Jun 22, 2021 at 18:11 | |||||
| Sep 18, 2019 at 17:04 | vote | accept | Ryan B | ||
| Mar 29, 2018 at 11:50 | history | tweeted | twitter.com/StackSecurity/status/979324823099924480 | ||
| Mar 29, 2018 at 10:11 | answer | added | Nomad | timeline score: 24 | |
| Mar 29, 2018 at 3:02 | comment | added | bonsaiviking |
Add --reason -v to your scan to see why Nmap chose each port state. filtered can mean "no response" but it can also mean "ICMP Admin Prohibited" and a few other ICMP codes. What is on the line that starts with "Not shown:" ?
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| Mar 28, 2018 at 20:45 | comment | added | Ryan B |
Even the official explanation on NMAPs website does not address this question: filtered : Nmap cannot determine whether the port is open because packet filtering prevents its probes from reaching the port. In my scenario, NMAP cannot determine whether ports 1, 2, 3, 4, 5 ,6 etc etc are open, because a packet filtering device blocks the probes, yet...we do not see all these ports listed in the output as filtered.
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| Mar 28, 2018 at 20:41 | comment | added | Ryan B |
I actually came across this posting, but did not find it valuable. While the question is essentially identical to mine, the responses do not address the question. He asks: If it's normal to see 21,25 and 1863 as "filtered", then why aren't all the other ports appearing as "filtered" too!? This is my question.
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| Mar 28, 2018 at 20:21 | comment | added | user171922 | Did you read this solution from the Unix & Linux portal? | |
| Mar 28, 2018 at 20:13 | review | First posts | |||
| Mar 28, 2018 at 20:21 | |||||
| Mar 28, 2018 at 20:10 | history | asked | Ryan B | CC BY-SA 3.0 |