Jellyfin.Server.Middleware.ExceptionMiddleware: Error processing request: Request does not contain a token. URL GET /socket

Problem:

Jellyfin.Server.Middleware.ExceptionMiddleware: Error processing request: Request does not contain a token. URL GET /socket

Solution:

Configure your webserver software to correctly proxy the URI /socket to Jellyfin. Here is an example for NGINX:

upstream jellyfin {
  server 172.18.0.1:8096;
}

server {
    location /socket {
        # Proxy Jellyfin Websockets traffic
        proxy_pass http://jellyfin/socket;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Protocol $scheme;
        proxy_set_header X-Forwarded-Host $http_host;
    }
}

Full NGINX conf