For most questions about Certbot, and all questions about Let’s Encrypt, it’s best to start with the Let’s Encrypt Community Forums (these are hosted by Discourse).

If you have a technical bug report, you can file it against the Certbot github issue tracker. Be sure to search for related issues first!

Our community can be contacted on IRC on the #letsencrypt and #letsencrypt-dev channels on irc.freenode.net.