Can't get a SSL certificate

[ivanprea]

Hello,
I was watching a video to how t setup duckdns and nginx to have a ssl certificate so a https (on CASAOS). But once i put my dns domain i got this error: CommandError: Saving debug log to /tmp/letsencrypt-log/letsencrypt.log
Some challenges have failed.
Ask for help or search for solutions at https://community.letsencrypt.org/. See the logfile /tmp/letsencrypt-log/letsencrypt.log or re-run Certbot with -v for more details.

at /app/lib/utils.js:16:13
at ChildProcess.exithandler (node:child_process:430:5)
at ChildProcess.emit (node:events:519:28)
at maybeClose (node:internal/child_process:1105:16)
at ChildProcess._handle.onexit (node:internal/child_process:305:5)

I don't know anything about this stuff honestly. I tried out of curiosity but i can't pass this step. Can someone help me?

[jacobemcken]

By default, the log file /tmp/letsencrypt-log/letsencrypt.log isn't exposed outside the Docker container.
When you know the id of the Docker container (you can find it using docker ps),
then you can enter the docker container using:

docker exec -it <CONTAINER ID> /bin/bash

Now you can open the log file using:

less /tmp/letsencrypt-log/letsencrypt.log

You can scroll up and down using arrow keys, Page Up and Page Down. You can quit less (a file viewer) using the key q.

The content of the log file should help you narrow down the problem.