Port Forwarding Problems

Hi,

I installed Passbolt on a Debian VM with nginx. We want to use Passbolt with portforwarding from our firewall to the machine, so we can access Passbolt with the URL like: https://vault.secetdomain.com:10443.
I changed the FullBaseUrl to vault.secretdomain.com, but I get a white screen. With the Firefox debugger, I noticed that the system tries to use the script with subpath without the changed port, so I won’t find the script.

I also tried to change the port of the nginx system, so it listens on 10443.
Nothing really helps.
What did I do wrong?

Thanks in advance.