Invalid origin error

Operating system

Linux

Joplin version

3.0.1

What issue do you have?

Hello!
I installed Joplin Server on the NAS and started it normally.
APP_BASE_URL http://192.168.xx.xx:22300 This is a LAN IP, I can open it normally on the LAN
But I need to access it on the public network and used internal network penetration software to obtain a public IP address——27.190.xx.xx, similar to port mapping, which maps the public IP address and port to the 22300 port of the 192.168.xx.xx. However, I encountered an error when accessing this address in my browser.

Invalid origin: http://27.190.xx.xx:7789

Do I need to write an additional APP-BASE-URL?

???
how