javax.net.ssl.SSLException: Certificate doesn't match any of the subject alternative names

Question

I recently added LetsEncrypt certificates to my server and my java applet is having problems connecting using TLS.

My applet uses Apache HttpClient.

My web s

Answer 1

/*
 * Inner class for Proxy SSL Socket Connection.
 */
static class MyConnectionSocketFactory extends SSLConnectionSocketFactory {
    private String proxyHost = null;
    private Integer proxyPort = null;

    public MyConnectionSocketFactory(final SSLContext sslContext, String proxyHost, Integer proxyPort) {
        super(sslContext, new NoopHostnameVerifier());
        this.proxyHost = proxyHost;
        this.proxyPort = proxyPort;
    }

    @Override
    public Socket createSocket(final HttpContext context) throws IOException {
        logger.debug("Create Socket:" + " ProxyHost: " + proxyHost + ", ProxyPort: " + proxyPort);
        InetSocketAddress socksaddr = new InetSocketAddress(proxyHost,proxyPort);
        Proxy proxy = new Proxy(Proxy.Type.SOCKS, socksaddr);
        return new Socket(proxy);
    }
}


   else if (proxyType.equalsIgnoreCase("socks")) {
        logger.debug("Proxy Type: " + proxyType);
        TrustStrategy acceptingTrustStrategy = new TrustStrategy() {
            @Override
            public boolean isTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
                return true;
            }
        };

        SSLContext sslContext = org.apache.http.ssl.SSLContexts.custom()
                .loadTrustMaterial(null, acceptingTrustStrategy)
                .build();
        SSLConnectionSocketFactory csf = new MyConnectionSocketFactory(sslContext, proxyHost, proxyPort);
        CloseableHttpClient httpClient = HttpClients.custom()
                .setSSLSocketFactory(csf)
                .build();
        HttpComponentsClientHttpRequestFactory requestFactory =
                new HttpComponentsClientHttpRequestFactory();
        requestFactory.setHttpClient(httpClient);
        restTemplate = new RestTemplate(requestFactory);
        return;
    } else {