Ports in use by WordPress site

Hello I just closed this topic: https://www.ads-software.com/support/topic/unable-to-connect-to-wordpress-site/#post-11770902

When I went on AWS to remove the firewall rule for ALLOW ALL Traffic the problem showed up again. Restored the firewall rule and it worked again. So, considering that I don’t want to keep such a permissive rule there forever for security reason, I would kindly ask if anybody knows on which port(s) the wordpress site is listening for connections. Many thanks indeed!