Estou desenvolvendo um aplicativo Android e preciso acessar um endereço HTTPS. Estou usando o Volley para solicitar meus dados, mas agora estou recebendo esse errocom.android.volley.NoConnectionError: java.io.IOException: Hostname '<address>' was not verified

Para obter a fábrica SSL, eu faço isso:

private static SSLSocketFactory getSocketFactory() {
    SSLSocketFactory socketFactory = null;


    try {
        final CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
        final BufferedInputStream bis = new BufferedInputStream(sContext.getResources().openRawResource(R.raw.cert)) ;

        Certificate certificate;
        try {
            certificate = certificateFactory.generateCertificate(bis);
        } finally {
            bis.close();
        }

        final String keyStoreType = KeyStore.getDefaultType();
        final KeyStore keyStore = KeyStore.getInstance(keyStoreType);
        keyStore.load(null, null);
        keyStore.setCertificateEntry("ca", certificate);

        final String tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
        TrustManagerFactory tmf = TrustManagerFactory.getInstance(tmfAlgorithm);
        tmf.init(keyStore);
        final SSLContext sslContext = SSLContext.getInstance("TLS");
        sslContext.init(null, tmf.getTrustManagers(), null);
        socketFactory = sslContext.getSocketFactory();
    } catch (Exception e) {
        Log.w(TAG, Log.getStackTraceString(e));
    }
    return socketFactory;
}

A inicialização da fila:

final HttpStack stack = new HurlStack(null, getSocketFactory());
final Cache cache = new NoCache();
final Network network = new BasicNetwork(stack);
sRequestQueue = new RequestQueue(cache, network);
sRequestQueue.start();

Aqui está o stacktrace:

    com.android.volley.NoConnectionError: java.io.IOException: Hostname 'url' was not verified
09-04 11:15:33.198   W/System.err﹕ at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:151)
09-04 11:15:33.198   W/System.err﹕ at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:112)
09-04 11:15:33.198   W/System.err﹕ Caused by: java.io.IOException: Hostname 'hml.services.vivara.com.br' was not verified
09-04 11:15:33.198   W/System.err﹕ at com.android.okhttp.Connection.upgradeToTls(Connection.java:201)
09-04 11:15:33.198   W/System.err﹕ at com.android.okhttp.Connection.connect(Connection.java:151)
09-04 11:15:33.198   W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:276)
09-04 11:15:33.198   W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211)
09-04 11:15:33.198   W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:373)
09-04 11:15:33.198   W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:106)
09-04 11:15:33.198   W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:208)
09-04 11:15:33.198   W/System.err﹕ at com.android.okhttp.internal.http.DelegatingHttpsURLConnection.getOutputStream(DelegatingHttpsURLConnection.java:218)
09-04 11:15:33.198   W/System.err﹕ at com.android.okhttp.internal.http.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:25)
09-04 11:15:33.198   W/System.err﹕ at com.android.volley.toolbox.HurlStack.addBodyIfExists(HurlStack.java:240)
09-04 11:15:33.198   W/System.err﹕ at com.android.volley.toolbox.HurlStack.setConnectionParametersForRequest(HurlStack.java:210)
09-04 11:15:33.198   W/System.err﹕ at com.android.volley.toolbox.HurlStack.performRequest(HurlStack.java:106)
09-04 11:15:33.198   W/System.err﹕ at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:96)

Procurei o erro, mas não encontrei nada para o meu caso. Alguém pode me ajudar?