Is it right that tls-alpn-01 only supports port 443?
I’ve been running my https services using eg. port 8080. However the challenges sent from letsencrypt go straight to port 443 now.
I’m using the current head of golang.org/x/crypto/acme as my client library. My requests that start the certificate issuance come in on https://mydomain.com:8585 (which makes GetCertificate to be called, and letsencrypt is asked to issue a certificate), but letsencrypts challenges come in to https://mydomain.com:443.
Is this a client bug or is 443 non-optional?