I receive a connection problem (or invalid certificate) when i want to connect to a proxy through NPM

[pvdochtend]

Checklist

• Have you pulled and found the error with jc21/nginx-proxy-manager:latest docker image? Yes
• Are you sure you're not using someone else's docker image? Yes
• If having problems with Lets Encrypt, have you made absolutely sure your site is accessible from outside of your network? It doesn't work probably related to my issue

Describe the bug Ireceive the message: "NET::ERR_CERT_AUTHORITY_INVALID". SSL Certificate states "localhost" when routing traffic to the correct port and hostname.

• What version of Nginx Proxy Manager is reported on the login page? 2.6.2

To Reproduce Steps to reproduce the behavior:

• Clean install.
• Added domain to proxy hosts
• Change hostfile on my client to test.domain.com (example domain).
• Use chrome to https://test.domain.com:7443 (my ports are: 780, 781 and 7443 because they were already in use on my docker host). My firewall is doing the translation to a different port.
• Receive the message: "NET::ERR_CERT_AUTHORITY_INVALID". SSL Certificate states "localhost"

Expected behavior I wanted to see the sote that's internally on the port.

Screenshots If applicable, add screenshots to help explain your problem.

Operating System

• Container runs on Synology / Docker. Chrome (86.0.4240.183) runs on Windows 10 20H2.