this post was submitted on 07 Jun 2026
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Caddy touble in Docker (lemmy.zip)
submitted 1 month ago by W3dd1e@lemmy.zip to c/selfhosted@lemmy.world
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Howdy! Sorry if this is a supid question. I've been trying to get this working for like 5 days and I've been researching and reading docs, but I'm just not getting it. I'm fairly new to selfhosing and I'm trying to set up Jellyfin remote access on my NAS. My NAS is a QNAP product running QTS (which I absolutely hate). QTS uses their own weird version of Docker.

When I start Caddy with a docker compose file, I get an error that port 443 is in use and the container can't be started. If I create a container in the Container Station app directly from the Docker Image, it starts up fine. Container Station handles environment variables in a dumb way so I am having trouble specifying the Caddyfile location when I do it that way.

Does anyone know why it works fine in that way but not the other? Both use port 443 but when I do it in a docker compose file, it says the port is in use but when I do it the other way, it doesn't and starts fine.

Note: I know you can do this with Tailscale also, but I want to use my custom domain to make it easier for sharing in the future.

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[–] ryannathans@aussie.zone 1 points 1 month ago (1 children)

You need root to bind to the first thousand ports, is it possible your container station is running as root or something to that effect? Does it work correctly when the port number is some other large number like 8921?

[–] W3dd1e@lemmy.zip 1 points 1 month ago (1 children)

It works fine with other ports, including 8443 and 444. It works in Container Station with 443 if I don’t use a Docker Compose file. The whole thing makes no sense.

I checked to see what was using 443 but all I get is “containerd”. I couldn’t find anymore info on what or why Containerd would be using that and no other containers are running.

[–] ryannathans@aussie.zone 1 points 1 month ago

Probably some proprietary interface the NAS provider set up