nmap showing port 21 (ftp) open, but port is actually closed

From: Mike Jones (sopiaz57@gmail.com)
Date: Fri Sep 09 2005 - 09:47:33 EDT

Has anyone ever seen this before, nmap is showing port 21 to be open on
a machine on the internet, but 21 is not listening on that machine. It
happens to all machines I scan outside the local area network.

Thanks in advance

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