ISP blocking port 443 and need to expose on different port and NAT


I just setup Jitsi Meet on Ubuntu 20.04 following this link

Worked great internally. However, I have some strange issue when trying to expose this externally. It seems my ISP is blocking port 443 so I had to use other port to expose and NAT it inside the Jitsi server. I natted 443/tcp, 4443/tcp and 10K-20K/udp. When I am connecting from external, it seems to connect but says Im the only one in the room. Though i am pretty sure that the room created is correct. Any experience on this and may I know the fix? Thanks in advance.

Make sure you change the port in bosh url in config.js