I ran out of all option on this domain stti.ca, can’t install a certificate and getting the following error.
Deleted and issued new certificates but still can’t issue a certificate.
Usually this is what I use to install same certificate on multiple domains. But somehow I just can’t make this work.
./letsencrypt-auto --apache -d stti.ca -d www.stti.ca
SendFailure - The underlying connection was closed: An unexpected error occurred on a send. Authentication failed because the remote party has closed the transport stream.
Letsencrypt prefers ipv6. But your http + ipv6 + /.well-known + non-www is redirected to /, this is bad. Your ipv4 + www is redirected to https, but your https doesn't work, there is the connection closed.
So perhaps remove your ipv6 dns entry (your AAAA entry) and remove the redirect http -> https, then check the domain again.
A redirect http -> https is possible. But https must work (certificate may be wrong). And
http + /.well-known/acme-challenge/filename should redirect to https + /.well-known/acme-challenge/filename, not to https + /