Nmap keeps returning different results?

sudo nmap -Pn -p- -A -vvv IP_ADDRESS

The same nmap command has told me that: 10 ports are open (but not 6379 for Redis), that 3 ports are open including 6379 for Redis, and that every single port is closed.

I’m doing a CTF so I don’t expect a firewall to be messing with my results, and this is against a Windows machine if it matters (hence the -Pn). I’ve tried varying the command a bit as well, but I still get inconsistent results.

TL;DR

Since defensive measures are unlikely, what could cause nmap to behave unpredictably? Could it be related to heavy traffic from other users? Is this somehow related to Windows, since I’ve only ever had this happen when scanning Windows machines?

I appreciate any input

submitted by /u/Agent-BTZ
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from hacking: security in practice https://ift.tt/3RLJPbH

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