Let’s Encrypt now (as of 2023) supports having certificates with no CN now, so long domains are fully supported: https://community.letsencrypt.org/t/simplifyin

Let’s Encrypt now (as of 2023) supports having certificates with no CN now, so long domains are fully supported: https://community.letsencrypt.org/t/simplifying-issuance-for-very-long-domain-names/207924 https://community.letsencrypt.org/t/simplifying-issuance-for... The previous workaround available was to include a second, shorter domain on the certificate but that wasn’t always easy or possible.