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I went to security group and add the rule for tcp 21

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But when use this tool to check the port, still say is closed.

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I know the tool works, because if I remove the line for http, then say port 80 is closed.

So why even when add the port to the security group still appear as closed?

EDIT: The FileZila server is running but still the port say is close on the public ip. Using FileZila client direct on the amazon machine I can connect to localhost. But from outside using the public ip I cant.

using netstats -an

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and netstats -ab

TCP    [::]:21                myserver:0         LISTENING
[FileZilla Server.exe]

TCP    0.0.0.0:21             myserver:0         LISTENING
[FileZilla Server.exe]
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  • Do you have an application listening on port 21? What happens if you try to connect from the command line on your instance to the FTP server? – Tim Feb 14 '18 at 22:14
  • @Tim I can connect to ftp if using localhost. But cant connect using public ip. Check edit. – Juan Carlos Oropeza Feb 16 '18 at 14:23
  • I suspect your FTP server is configured incorrectly, but I'm not sure quite how. – Tim Feb 16 '18 at 18:47
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A service must be running on the port for it to be open. Start your FTP server.

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  • Thanks Michael, the FileZilla server is running but still show the port is closed. Please check the edit. – Juan Carlos Oropeza Feb 16 '18 at 14:19

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