Please fill out the fields below so we can help you better. My domain is: Cannot reveal I ran this command: certbot certonly --standalone -d my.domain.com It produced this output: IMPORTANT NOTES: The following errors were reported by the server: Domain: my.domain.com Type: connection …

Are you behind some sort of router which needs a portmap for port 443?

are you intending to use the TLS-SNI challenge? if so do you understand how that challenge works?

This solved our renewal issue as well, thanks @nickleus !

Urn:acme:error:connection

nickleus March 8, 2017, 4:34pm 4

open port 443 in yor firewall:
ufw allow 443/tcp

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