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copied!<p>You are right, <code>*_anon_*</code> ciphers are used for a complete unauthenticated connection (both server and client are anonymous). With these cipher suites no certificate is required. I wrote a small code to test:</p> <pre><code>ServerSocketFactory sf = SSLServerSocketFactory.getDefault(); final SSLServerSocket socket = (SSLServerSocket)sf.createServerSocket(443); System.out.println(Arrays.toString(socket.getSupportedCipherSuites())); System.out.println(Arrays.toString(socket.getEnabledCipherSuites())); socket.setEnabledCipherSuites(new String[] {"SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA"}); Thread t = new Thread() { public void run() { try { Socket client = socket.accept(); client.getOutputStream().write("Hello World\n".getBytes("ASCII")); client.close(); } catch (IOException ioe) { } } }; t.start(); Thread.sleep(2000); SSLSocket client = (SSLSocket) SSLSocketFactory.getDefault().createSocket("localhost", 443); client.setEnabledCipherSuites(new String[] {"SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA"}); InputStream in = client.getInputStream(); byte[] data = new byte[1024]; int len = in.read(data); System.out.println(new String(data, 0, len)); </code></pre> <p>I know that this code is not perfect but I successfully exchange data between the client and the server. Maybe your server or client socket is not well configured. Can you give the full stacktrace you got?</p> <p>Note that these ciphers are deprecated since there are vulnerable to man-in-the-middle attacks. </p> <p><strong>UPDATE</strong> : I found the issue. The <code>anonCipherSuitesSupported</code> array length is too long. Therefore after adding the <code>*_anon_*</code> the array is ending with a bunch of <code>null</code> values. And the implementation does not seem to accept <code>null</code> in the enabled cipher list.</p> <pre><code>String[] supported = server.getSupportedCipherSuites(); List<String> list= new ArrayList<String>(); for(int i = 0; i < supported.length; i++) { if(supported[i].indexOf("_anon_") > 0) { list.add(supported[i]); } } String[] anonCipherSuitesSupported = list.toArray(new String[0]); </code></pre>

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