"In QNAP QTS, Port 443 is the default secure port for,..."
If it says it's already in use it's because it's already in use. Try changing the QNAP management UI port.
this post was submitted on 07 Jun 2026
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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?
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.
Is your Caddy actually reachable on port 443 when you use the Container Station App?
My first thought was that your NAS might use port 443 for its own web ui?
Yeah, most likely the Compose version is aware of the ports in use and 443 is pretty standard for the NAS to keep to itself. The direct docker process would not be aware of the default config, or env Vars.
Also, welcome to Selfhosing! 😂
Yes it works fine if I build the container from The imagine directly inside the container station app, but I’m having trouble pointing that to the Caddyfile.
If I try to create the container from a docker compose file, it says it can’t bind to port 443 because it’s already in use.
When I start Caddy with a docker compose file,
So, I've never owned a QNAP product running QTS nor have I run Caddy in a Docker container before, but I am assuming it looks something similar to this:
spoiler
networks:
proxy-network:
external: true
services:
caddy:
image: caddy
container_name: caddy
restart: unless-stopped
ports:
- 80:80
- 443:443
volumes:
- ./data:/data
- ./config:/config
- ./Caddyfile:/etc/caddy/Caddyfile:ro
networks:
- proxy-network
Have you tried changing the port #:
ports:
- 80:80
- 4443:443
ETA:
I’m fairly new to selfhosing
Welcome to the club bro. You're in the right place.
Yeah, I can do that. I just wanted to understand why it work sometimes but not others.
I HATE QTS. It’s all proprietary software and it’s locked down so I can’t use CLI at all unless I SSH into it. And when I do that, I still can’t add 3rd party software that isn’t in their App Store because there is no apt, dnf, brew, or other similar tools.
I’ve been considering trying to install TrueNAS or something else on it but it sounds like that will be a hassle too because the fans don’t want to work.
If I had to guess, the container station might be giving the docker container a new network/ip address, one that the NAS is not using so that port 443 works and doesn't conflict with the NAS. If you start the container station then inspect the container you might see how they do it, but macvlan is typically how you would configure it.
services:
my-lan-service:
image: nginx:latest
container_name: lan_container
# 1. Attach the service to the custom macvlan network
networks:
lan_network:
ipv4_address: 192.168.1.200 # The dedicated LAN IP for this container
# 2. Ports are exposed directly to the LAN; do NOT use the "ports" block
restart: unless-stopped
networks:
lan_network:
driver: macvlan
driver_opts:
parent: eth0 # Change to your host's physical network interface name
ipam:
config:
- subnet: 192.168.1.0/24 # Matches your physical local network setup
gateway: 192.168.1.1 # Your physical router IP
Yeah, I can do that. I just wanted to understand why it work sometimes but not others.
It's been a few minutes since I've run Caddy, and like I mentioned, I don't own a QNAP. So, I'm just spitballing.
This probably doesn’t help you much right now but I have a QNAP as well. And I too despise the QTS software. But I found out that TrueNAS can run on it pretty easily. I have an NVME drive on a usb-c enclosure that I installed trueNAS on and it boots fine into it. If I ever wanna go back it’s just a remove the boot drive and reformat (the ZFS pools are compatible unfortunately).
Actually I’ve been strongly considering swapping the OS to TrueNAS but I’ve heard some people have trouble with getting the fans to work once they switched over. If you’ve had a good experience I’m willing to give it a shot.
NASes are so annoying. I had so many issues with my Synology NAS with plex and jellyfin. I ended up spinning up a debian server on a small Dell optiplex micro and then mounted my Nas as storage through debian. Installed Jellyfin as a normal debian package. No docker or anything like that. I've never used (or even heard of) QNAP, but are you able to reach it through SMB? If you can, then you can do it like I did