502 Bad Gateway - Accessing Dashy on LXC via HTTPS/SSL, behind NGINX Proxy on different LXC?

[BlackrazorNZ]

Hi there,

First of all, thanks for your work on Dashy - it's awesome - so much more fun to tinker with than other 'homepages' I've tried, and you even got me into learning how to YAML/JSON a bit which is an achievement for a crotchety old fart like me! :)

To my question: I have a small home server set up running Adguard, NGINX Proxy, Home Assistant, and now Dashy.

HA is on a VM and the others are on LXC's, all running on a Proxmox VE hypervisor.

All of the above works perfectly, and I can access everything except Dashy via the proxy using Lets Encrypt certificates generated on the NGINX Proxy.

I can also access Dashy just fine if I use the HTTP transport and point it at port 4000 on the Dashy LXC.

However, I cannot for the life of me get it working on HTTPS / SSL, even though I have the appropriate SSL cert setup just like the other hosts that are pointed at via HTTPS.

I have tried pointing at both ports 4001 and 443 (the indicated ports in the documentation), however I still get the 502 Bad Gateway error.

Do you know where I need to look, which port I need to point it at, or which setting I need to change to assign an appropriate port so that Dashy can listen to, and receive, certed HTTPS redirects from NGINX?

Many thanks for any help!