Juan Carlos Oropeza asked:
I went to security group and add the rule for tcp 21
But when use this tool to check the port, still say is closed.
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?
A service must be running on the port for it to be open. Start your FTP server.
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