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This process requires port 80 access to your PBX from,, and Using world. Ideally you would use System Admin, Port Management, configure either the Admin interface or UCP to respond on port 80to configure port 80 dedicated to Let's Encrypt renewal.

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.