Service domain for kf.mydomain.com from nginx reverse proxy

I’m not sure if I understood what you want to do, but I’ll tell what I did, First I configure my proxy server (NGINX) and get the ssl certificate, you should check this answer:

Then this are the configuration I used, notice that *“Is your reverse-proxy/load-balancer installed on this server?” is set as Yes to allow me to configure the listening port.

Do you want to use HTTPS?
1) Yes
2) No
[1]:
╔════════════════════════════════════════════════════════════════════╗
║ ║
║ Please note that certificates must be installed on a reverse-proxy ║
║ or a load balancer.kobo-install can install one, if needed. ║
║ ║
╚════════════════════════════════════════════════════════════════════╝
Auto-install HTTPS certificates with Let's Encrypt?
1) Yes
2) No - Use my own reverse-proxy/load-balancer
[2]:
Is your reverse-proxy/load-balancer installed on this server?
1) Yes
2) No
[1]:
Internal port used by reverse proxy?
[8080]:

Hope it helps.

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