since the migration from Android 13 to Android 14, I am no longer able to connect from Android to a local box containing its own certificate.
This is below my code :

        SSLSocketFactory factory = (SSLSocketFactory) SSLSocketFactory.getDefault();
        SSLSocket soc = (SSLSocket) factory.createSocket();

        String[] protocols = soc.getEnabledProtocols();

        System.out.println("BEFORE Enabled protocols:");
        for (String s : protocols) {
            System.out.println(s);
        }

        store = KeyStore.getInstance(KeyStore.getDefaultType());
        TrustManagerFactory tmf = TrustManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
        tmf.init(store);
     //   context = SSLContext.getInstance("TLS");
        TrustManager[] trustAllCerts = new TrustManager[]{
                new X509TrustManager() {
                    public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                        return null;
                    }
                    public void checkClientTrusted(
                            java.security.cert.X509Certificate[] certs, String authType) {
                    }
                    public void checkServerTrusted(
                            java.security.cert.X509Certificate[] certs, String authType) {
                    }
                }
        };

        context = SSLContext.getInstance("TLSv1");
        context.init(null, trustAllCerts, new java.security.SecureRandom());

        soc=  (SSLSocket)context.getSocketFactory().createSocket();

        protocols = soc.getEnabledProtocols();

        System.out.println("After Enabled protocols:");
        for (String s : protocols) {
            System.out.println(s);
        }


        ArrayList enabled = new ArrayList();
        String[] supported;
        System.out.println("Enabled CipherSuites:");
        supported = soc.getSupportedCipherSuites();
        for (String s : supported) {
            System.out.println(s);
            enabled.add(s);
        }
        String[] newSupported = (String[]) enabled.toArray(new String[0]);

        socket = (SSLSocket)context.getSocketFactory().createSocket(host, port);
        ((SSLSocket)socket).setEnabledCipherSuites(newSupported);
        ((SSLSocket) socket).setEnabledProtocols(new String[] {"TLSv1"} );
        input = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
        output = new DataOutputStream(socket.getOutputStream());

        out = new PrintWriter(
                new BufferedWriter(new OutputStreamWriter(
                        socket.getOutputStream(), "UTF-8")), true);

On Android 13 it works, but on Android 14 I get SSLHandshakeException SSL routines:OPENSSL_internal:KEY_USAGE_BIT_INCORRECT

It seems the problem is with the self-signed certificate.
Looking on the web I saw that it is now necessary to import the certificates into the App User Certificate, but I am not able to do it because I do not have access to the private key of this certificate, because it belongs to the local box.
Has anyone found a workaround for Android 14?
Thank you for your help, I’ve been looking for a solution for a week!