How do I specify a port other than 80 when adding SSL certificate using Certbot?

port lets-encrypt certbot

There is no way to specify a different port than defaults (80/443).

I recommend you to use the acme-dns validation. I use it and it works fine. More details here : https://www.digitalocean.com/community/tutorials/how-to-acquire-a-let-s-encrypt-certificate-using-dns-validation-with-acme-dns-certbot-on-ubuntu-18-04

Equally acme-dns is very useful to issue Let's Encrypt certificates for an intranet with public domain.

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