Can't see the videos of other participants

Hi Team.
I installed jitsi according to the documentation (Self-Hosting Guide).
When there are only two people in the room, I can see videos of others. But when the third person entered the room, I could only see my own video.

My server has an public IP address (, so I only open the port in the firewall.
I have opened the following ports in the firewall:

$ sudo ufw status
Status: active

To                         Action      From
 --                         ------      ----
80/tcp                     ALLOW       Anywhere                  
443/tcp                    ALLOW       Anywhere                  
10000/udp                  ALLOW       Anywhere                  
22/tcp                     ALLOW       Anywhere                  
3478/udp                   ALLOW       Anywhere                  
5349/tcp                   ALLOW       Anywhere                  
80/tcp (v6)                ALLOW       Anywhere (v6)             
443/tcp (v6)               ALLOW       Anywhere (v6)             
10000/udp (v6)             ALLOW       Anywhere (v6)             
22/tcp (v6)                ALLOW       Anywhere (v6)             
3478/udp (v6)              ALLOW       Anywhere (v6)             
5349/tcp (v6)              ALLOW       Anywhere (v6)

I checked the port 10000 to make sure it was opened:

# echo "123" | nc -u 10000

# nc -l 10000 -u


This is my configuration file:

openjdk version:

# java -version
openjdk version "1.8.0_292"
OpenJDK Runtime Environment (build 1.8.0_292-8u292-b10-0ubuntu1~18.04-b10)
OpenJDK 64-Bit Server VM (build 25.292-b10, mixed mode)

This problem has bothered me for a long time. I have also read many related topics on the forum and tried the solutions they mentioned, but they have no effect.

I hope to get some help from the team to solve this problem.

Thank you!

You don’t need the NAT_HARVESTER... lines.

Do you connect to the server using IP?

yes.I use the ip address to install jitsi

What is the prosody version?

Where did you run “echo 123 | ...” command

# dpkg -l | grep prosody
ii  jitsi-meet-prosody               1.0.5307-1                                      all          Prosody configuration for Jitsi Meet
ii  prosody                          0.11.9-1~bionic1                                amd64        Lightweight Jabber/XMPP server

If you run the echo command on the same server then it doesn’t work to understand about UDP/10000 connectivity. You should run it on an other machine

I checked 10000 ports on different servers:

Is JVB running?

systemctl status jitsi-videobridge2.service

When I checked your server with 3 participants, it seems working.

How do you test it?
What is your chrome version if you test with chrome?

Chrome, chrome’s traceless window, and mobile Chrome web pages

According to the shared picture, no problem if the participant enables her camera.

Are the participants on the same network with the server?

No, it isn’t.
The server I use is provided by Tencent cloud, and I test it in the company’s work network

There may be an issue on the client-side network.

Did you run echo 123... command from your company’s network?

I cannot see a problem when I check your server. In my opinion there should be an issue on your client-side.

Can you show me a screenshot of multiple users in the same room?

Did you stop the videobridge?

systemctl status jitsi-videobridge2.service

I’ve restarted the service