Websockets configuration with nginx and SSL

After adding the SSL certificates successfully, we are getting a timeout error on the browser. See here screenshot of the browser's log: [login to view URL] Has anyone experienced anything similar? Please, let me know if you need more details of the set up. See below our nginx configuration listen 443 ssl; # managed by Certbot ssl_certificate /etc/letsencrypt/live/casista.com-0001/[login to view URL]; # managed by Certbot ssl_certificate_key /etc/letsencrypt/live/casista.com-0001/[login to view URL]; # managed by Certbot include /etc/letsencrypt/[login to view URL]; # managed by Certbot ssl_dhparam /etc/letsencrypt/[login to view URL]; # managed by Certbot upstream chatserver { server [login to view URL]; } client_max_body_size 4G; access_log /var/log/nginx/[login to view URL]; error_log /var/log/nginx/[login to view URL]; location = /[login to view URL] { access_log off; log_not_found off; } location / { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto https; proxy_set_header Host $host; proxy_redirect off; if (!-f $request_filename) { proxy_pass http://unix:/home/ubuntu/mywasi-root/mywasi/[login to view URL]; break; } # include proxy_params; location /ws { # proxy_pass [login to view URL]; proxy_pass http://chatserver; # proxy_pass http://localhost:8765; proxy_connect_timeout 7d; proxy_read_timeout 7d; proxy_send_timeout 7d; proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "upgrade"; } auth_basic "Restricted content"; auth_basic_user_file /etc/nginx/.htpasswd; } location /static/ { alias /home/ubuntu/mywasi-root/mywasi/staticfiles/; autoindex off; } location /media/ { alias /home/ubuntu/mywasi-root/mywasi/media/; autoindex off; }