nginx not reachable

I have a Bitwarden docker running, but the container is somehow not reachable. If I try to access https://my.domain.tld:9443/ Chrome shows “ERR_CONNECTION_CLOSED”.

The containers are up and running and the ports seem to be correct for me.

# docker container ls
CONTAINER ID        IMAGE                            COMMAND             CREATED             STATUS              PORTS                            NAMES
b454ebeb3af5        bitwarden/icons:1.25.0           "/entrypoint.sh"    27 hours ago        Up 27 hours         5000/tcp                         bitwarden-icons
127d889c932a        bitwarden/nginx:1.25.0           "/entrypoint.sh"    27 hours ago        Up 27 hours         80/tcp, 0.0.0.0:9443->8443/tcp   bitwarden-nginx
a8cc679d2907        bitwarden/attachments:1.25.0     "/entrypoint.sh"    27 hours ago        Up 27 hours         5000/tcp                         bitwarden-attachments
b06149bf8406        bitwarden/api:1.25.0             "/entrypoint.sh"    27 hours ago        Up 27 hours         5000/tcp                         bitwarden-api
01aa05e22087        bitwarden/identity:1.25.0        "/entrypoint.sh"    27 hours ago        Up 27 hours         5000/tcp                         bitwarden-identity
8c55143dcf32        bitwarden/mssql:1.25.0           "/entrypoint.sh"    27 hours ago        Up 27 hours         1433/tcp                         bitwarden-mssql
c6bd7e9fc9f5        bitwarden/notifications:1.25.0   "/entrypoint.sh"    27 hours ago        Up 27 hours         5000/tcp                         bitwarden-notifications
3c78402b8a06        bitwarden/web:2.4.0              "/entrypoint.sh"    27 hours ago        Up 27 hours         5000/tcp                         bitwarden-web
8f340cb4ff7e        bitwarden/admin:1.25.0           "/entrypoint.sh"    27 hours ago        Up 27 hours         5000/tcp                         bitwarden-admin

The nginx error log within the container shows nothing and the access log also doesn’t show any accesses in the access.log, so the request doesn’t seem to go through, but I think it’s not a firewall issue.

# ufw status
Status: active

To                         Action      From
--                         ------      ----
[...]               
9443/tcp                   ALLOW       Anywhere                  
9443/tcp (v6)              ALLOW       Anywhere (v6)

I don’t know what the issue could be, so hopefully someone can give me a good idea how to solve this.

Have you opened this port on your host machine’s firewall?

ufw status shows, that the port 9443 is open on the host machine. If I disable ufw, it still doesn’t work.