I've seen this discussed in another conversation thread, but there was no solution.
This is a new install of Emby on 2 separate Qnap systems. Both do not work when I open the web interface.
I'm getting:
This site can’t be reached
192.168.1.21 refused to connect.
full url is 192.168.1.21:8920 (also tried http and https)
I rebooted both servers but get the same issues (refused to connect).
I have also installed Emby on a Synology server (last night) without any issues, although the web interface port opening in Chrome from that NAS is 8096 ... I've also tried that with the two Qnap addresses without success.
Note: The exclamation mark in the QNAP screenshot is due to the absence of a digital signature.