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How to update prosody in Jitsi Meet in Ubuntu OR How to solve the issue of disconnected participants shown in the conference

After updating the prosody server you need to change in prosody config /etc/prosody/conf.avail/your-domain.com.cfg.lua like below

cross_domain_websocket = true;
consider_websocket_secure = true;

  VirtualHost "your-domain.com"
         ...
         modules_enabled = {
            "bosh";
            "websocket";
            "smacks";
            ...
         }

         smacks_max_unacked_stanzas = 5;
         smacks_hibernation_time = 60; 
         smacks_max_hibernated_sessions = 1;
         smacks_max_old_sessions = 1;

Update your Nginx config file /etc/nginx/sites-available/your-domain.com.conf like below

server 
{
    listen your-domain.com:443 ssl http2;
    server_name your-domain.com;

# ...

    location = /xmpp-websocket
    {
        proxy_pass http://localhost:5280/xmpp-websocket;
       

        add_header 'x-jitsi-shard' 'shard';
        add_header 'x-jitsi-region' 'us-east-2a';
        add_header 'Access-Control-Expose-Headers' 'X-Jitsi-Shard, X-Jitsi-Region';

        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header Host $http_host;

        proxy_http_version 1.1;
        proxy_buffer_size 128k;
        proxy_buffers 4 256k;
        proxy_busy_buffers_size  256k;
        proxy_set_header Connection "upgrade";
        tcp_nodelay on;
    }
# ...

Check shard and region from /etc/jitsi/meet/your-domain.com-config.js deploymentInfo:{} section

Update /etc/jitsi/meet/your-domain.com-config.js file uncomment WebSocket like below

    websocket: 'wss://your-domain.com/xmpp-websocket',

Restart services like below

service nginx restart && service prosody restart && service jicofo restart