Hi folks, I have a couple of Hugo websites being served by Caddy already (they work properly). I am trying to create a copy of an existing Hugo website on my Caddy server, but at a different domain name (the previous version was for testing purposes). This domain name was previously pointing at a Weebly site, but I changed the nameservers to point at my webserver this afternoon.
When visiting my new website I am successfully connecting to my webserver (i.e. DNS is giving me the correct IP address), but receiving a 404 message:
404 Site www.robertmcfaddenmd.com is not served on this interface
I used “sudo journalctl -u caddy” to see what errors I can see, and here is the relevant part of the log:
Apr 19 18:02:56 caprice systemd[1]: Reloaded Caddy HTTP/2 web server.
Apr 19 18:02:56 caprice caddy[3358]: 2018/04/19 18:02:56 [INFO][robertmcfaddenmd.com] acme: Obtaining bundled SAN certificate
Apr 19 18:02:57 caprice caddy[3358]: 2018/04/19 18:02:57 [INFO][robertmcfaddenmd.com] AuthURL: https://acme-v02.api.letsencrypt.org/acme/authz/ixuGQnHHrb8SCPqIB5tF57C2D8O5IqnSqCRyRxo4Zf8
Apr 19 18:02:57 caprice caddy[3358]: 2018/04/19 18:02:57 [INFO][robertmcfaddenmd.com] acme: Authorization already valid; skipping challenge
Apr 19 18:02:57 caprice caddy[3358]: 2018/04/19 18:02:57 [INFO][robertmcfaddenmd.com] acme: Validations succeeded; requesting certificates
Apr 19 18:02:58 caprice caddy[3358]: 2018/04/19 18:02:58 [INFO][robertmcfaddenmd.com] Server responded with a certificate.
Apr 19 18:02:58 caprice caddy[3358]: 2018/04/19 18:02:58 [ERROR] SIGUSR1: [robertmcfaddenmd.com] failed to obtain certificate: acme: Error → One or more domains had a problem:
This is driving me nuts because it says “One or more domains had a problem:” but does not say what the problem is!!! How can I see a more detailed error message?
Also, what is going wrong and how can I make my website work? 
Looking at the Let’s Encrypt AuthURL, it appears to be seeing the correct IP address, so I don’t think the problem is that DNS hasn’t updated to point at my webserver yet.
UPDATE: Forgot to include my Caddyfile, here it is:
robertmcfaddenmd.com, www.robertmcfaddenmd.com {
root /srv/robertmcfaddenmd.com/public # the folder where Hugo generates the website
hugo /srv/robertmcfaddenmd.com /admin
redir 301 {
if {host} starts_with robertmcfaddenmd.com
/ https://www.robertmcfaddenmd.com{uri}
}
expires {
match .png$ 1y # expires png files after one year
match .jpg$ 1y # expires jpg files after one year
match .html$ 5i30s # expires html files after 5 minutes 30 seconds
match .css 1y # expires css files
}
gzip
errors {
404 404.html # Not Found
}
}