HTTPS on ECS with docker, Let's Encrypt with no http server

[brundozer]

I’ve managed to solve the issue. It was simply a permission issue on the files generated by Let’s Encrypt. The only error I got was the one that I described in my first post. It is quite frustrating that there is no clear error message saying that the certificates could not be read.

I have found this post describing a similar issue, but as the author solved the problem by using nginx, which runs as root and is therefore allowed to read the certificates generated by Let’s Encrypt, I have missed the second reply which would have fixed my issue:

Phoenix app in docker with ssl not receiving anything on port 443

This suggests that the TCP connection to the Phoenix app was established, but it was closed before any TLS handshake messages were sent by the server. This usually means there is a problem with your certificate/key files: Erlang’s :ssl does not verify the locations at startup, but only once the files are actually needed during the handshake. If it can’t read the files, the ssl socket crashes, and curl reports what you see. So check if the env vars are correct, the files are present and readabl…

Anyway, thanks for the help!