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    <p>I found an odd behavior experimenting with the suggested code here. </p> <p>It appears that, after a default ProxySelector has been set, regular socket code (e.g. creating a new Socket) does not work anymore, because it tries to use a socks server (not sure why it would do this, but for me it does). </p> <p>So if you, when calling</p> <pre><code>Socket socket = new Socket(host, port); </code></pre> <p>you receive such a SocketException:</p> <pre><code>java.net.SocketException: Malformed reply from SOCKS server at java.net.SocksSocketImpl.readSocksReply(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.&lt;init&gt;(Unknown Source) at java.net.Socket.&lt;init&gt;(Unknown Source) </code></pre> <p>then try setting the default ProxySelector back to null:</p> <pre><code>ProxySelector.setDefault(null); </code></pre> <p>For me this resulted in the following small Java class which I now use to simply retrieve the systems proxy settings without having it affect the further usage of Sockets() of the application, yet configuring the system properly to use the proxy:</p> <pre><code>public class ProxyConfig { private static String host; private static int port; public static void init() { System.setProperty("java.net.useSystemProxies", "true"); Proxy proxy = getProxy(); if (proxy != null) { InetSocketAddress addr = (InetSocketAddress) proxy.address(); host = addr.getHostName(); port = addr.getPort(); System.setProperty("java.net.useSystemProxies", "false"); System.setProperty("http.proxyHost", host); System.setProperty("http.proxyPort", ""+port); } System.setProperty("java.net.useSystemProxies", "false"); } public static String getHost() { return host; } public static int getPort() { return port; } private static Proxy getProxy() { List&lt;Proxy&gt; l = null; try { ProxySelector def = ProxySelector.getDefault(); l = def.select(new URI("http://foo/bar")); ProxySelector.setDefault(null); } catch (Exception e) { e.printStackTrace(); } if (l != null) { for (Iterator&lt;Proxy&gt; iter = l.iterator(); iter.hasNext();) { java.net.Proxy proxy = iter.next(); return proxy; } } return null; } } </code></pre>
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