Gateway NEVER SEEN at Chirpstack GUI

I have successfully installed all packages needed for Chirpstack server on my Ubuntu pc.
Also installed Chirpstack-gateway-bridge on gateway (which is Dragino LG308).

Once I use docker-compose I’m able to enter chirpstack GUI (on http://localhost:8080).

The problems turns out once I try to add my Dragino Gateway to chirpstack…

I have created all profiles needed and put my Gateway ID correctly. However, I can’t check my gateway is correctly connected due to the fact that it says: “Last seen at: Never” on Chirpstack GUI.

Any idea what could be wrong?

Thanks very much in advance