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Running the following command from a host that is public from the point of view of your Open edX instance is useful
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nmap -Pn -p- edx.mydomain.info |
The fewer ports that are open the better. You should be concerned if more than 80 (http), 443 (https) and 22 (ssh) are open. Ideally 22, ssh, would also be limited to networks that you control.
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