SSL/Let's Encrypt instructions

I can’t find detailed instructions on how to set up Let’s Encrypt with Mup, and how to test if it’s working properly?

So far I’ve followed the instructions here: https://certbot.eff.org/#ubuntuxenial-nginx and added the proxy block to my mup.js file, but I don’t see anything different? Did I miss something?

[x5engine]

Doing mup proxy logs-le which gives the prox letsencrypt logs I get this error which clearly shows an issue. mup version 1.3.7

Contents of /app/letsencrypt_service_data did not change. Skipping notification '/app/signal_le_service'
[35.238.236.162]2019-02-04 20:34:03,716:ERROR:simp_le:1446: CA marked some of the authorizations as invalid, which likely means it could not access http://example.com/.well-known/acme-challenge/X. Did you set correct path in -d example.com:path or --default_root? Are all your domains accessible from the internet? Please check your domains' DNS entries, your host's network/firewall setup and your webserver config. If a domain's DNS entry has both A and AAAA fields set up, some CAs such as Let's Encrypt will perform the challenge validation over IPv6. If your DNS provider does not answer correctly to CAA records request, Let's Encrypt won't issue a certificate for your domain (see https://letsencrypt.org/docs/caa/). Failing authorizations: https://acme-v01.api.letsencrypt.org/acme/authz/I2dHz2RyzeySycmtB2nkqUtMYTbfphXhADplGJq4wec
[35.238.236.162]Challenge validation has failed, see error log.

Can you clearly show what’s the issue? and also say what steps should we take to setup ssl properly! Docs are not clear tbh Thanks

[SachaG]

Actually I did see something different, the app went down and I started getting 521 errors. I’m looking into it, but I still feel like a more detailed guide would be super helpful 😃