portainer: container console freezes when using other apps or windows in the browser

Pretty sure the issue here (at least when NGINX is involved) is the proxy_read_timeout setting. For a long running socket connection like a websocket, if nothing is read from the proxied connection after 60 seconds (default) the connection will be closed. Once closed, there doesn’t seem to be any reconnect code on the client side, so the console is basically “dead”. I just bump up the setting to 7 days for the websocket path. Nothing lives on my desktop longer than that 😉

  location / {
    proxy_pass http://127.0.0.1:9000/;
    proxy_buffering off;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $http_connection;
    proxy_set_header    Host                $http_host;
    proxy_set_header    X-Real-IP           $remote_addr;
    proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
  }

  location /api/websocket {
    proxy_pass http://127.0.0.1:9000/api/websocket;
    proxy_read_timeout 10080m;
    proxy_buffering off;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $http_connection;
    proxy_set_header    Host                $http_host;
    proxy_set_header    X-Real-IP           $remote_addr;
    proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
  }

Thank you @Codelica , proxy_read_timeout is the answer