How to setup EPL with SSL-certificates from let'sEncrypt ans dynDNS

[jonas-klein]

I'm not able to establish an ssl connection to my EPL-instance using a let'sEncrypt certificate. I don't know if i did everything right or if i missed something. My target OS is raspbian, but i'm experiencing the same issue in a Debian VM. The certificate is for a subdomain on a dynDNS-service. Do i have to make some DNS-settings on my DNS-provider?

when i run the EPL-instance, there were no errors logged, refer to the img: screen1
when i try to connect with the webbrowser, nothing else is logged.

What i've done so far

1. Install EPL
   I've installed EPL in my Debian VM via the steps from README.md

curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -
sudo apt install -y nodejs
git clone --branch master https://github.com/ether/etherpad-lite.git
cd etherpad-lite
src/bin/run.sh

2. forward Router firewall ports
   In the settings of my router, i've forwarded the ports 9001, 80, 443 to the VM (bridged)

3. Certificate obtained from let'sEncrypt
   i've installed certbot via apt

sudo apt install certbot

and then, ive obtained the certificate via

sudo certbot certonly --standalone -d sudomain.ddns.net

4. certificates referenced to settings.json
   in settings.json i've uncommented the SSL-part and set the paths to the certificate-files

"ssl" : {
"key" : "/etc/letsencrypt/live/sudomain.ddns.net/privkey.pem",
"cert" : "/etc/letsencrypt/live/sudomain.ddns.net/cert.pem",
"ca": ["/etc/letsencrypt/live/sudomain.ddns.net/chain.pem"]
},
I made sure, that the user, who runs EPL, has read-access to the files

5. run EPL
   as the last step, i've run EPL via

./src/bin/run.sh

from another network, firefox couldn't establish a connection to EPL via "https://sudomain.ddns.net/" with the message "Unable to connect". If i use Google Chrome, the error message is "ERR_CONNECTION_REFUSED".

screen1