Nginx ssl configuration problem on Debian

We have recently updated our Jitsi server to 2.0.5076-1 running on Debian 10. The app works fine in a browser, but we are no longer able to check the site certificate and TLS config using openssl/nmap/wget or https://www.ssllabs.com/ssltest/

Browser reports: TLVv1.2 connection using TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
SSLLabs reports: Assessment failed: No secure protocols supported
wget reports: GnuTLS: The TLS connection was non-properly terminated. Unable to establish SSL connection.
nmap reports: No response from server: EOF

I am sure there is something wrong with the nginx configuration, but I cannot work out what it is.
We are using a lets encrypt certificate and have used the /usr/share/jitsi-meet/scripts/install-letsencrypt-cert.sh to configure nginx.

I would be grateful if anyone could help me shed some light on this.

Do you have /etc/nginx/modules-enabled/60-jitsi-meet.conf

Hi,
Yes do have that file in place, and now I understand how port 443 is open and that is just proxying to port 4444 where the SSL settings are configured.
I guess there is some interaction with proxying 443 to 4444 that is causing the tools I have listed to be unable to connect to the site.

I think I have understood this. The 60-jitsi-meet.conf file is proxying non-http traffic to a service called turn on port 5349 but there is nothing listening on this port. I have made the following edit and now all these other tools can talk to the webserver. I now just need to understand what the service on port 5349 is for and if we need it.

    map $ssl_preread_alpn_protocols $upstream {
        ~\bh2\b         web;
        ~\bhttp/1\.     web;
        default         web;
        #default         turn;
    }

Turnserver

Thanks for your help.