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This process requires port 80 access to your PBX from outbound1.letsencrypt.org, outbound2.letsencrypt.org, mirror1.freepbx.org and mirror2.freepbx.org. Using System Admin, Port Management, configure either the Admin interface or UCP to respond on port 80.
If you have the Commercial (Full) Sysadmin module, you can specify that a 'LetsEncrypt Only' service listens on port 80. See the Port Management page for more information.
There are several required options to generate a Let's Encrypt Certificate