Starting connection to server, please wait

Hi all, after fixed the WebRTC issue, than I start to host a demo on personal pc
I turn off the firewall and opened the require port on router and DMZ
It work fine on local network in public ip, also tried on 4G network of smartphone
But When I tried to connect from other wifi, than appear “Starting connection to server, please wait”
Even I tried host on AWS and another personal pc also get the same result, guys any idea?
Thanks!