Java Android-Socket客户端通信在Emulator上工作，但在使用VPN的手机上发生“IOException”。

Socket客户端通信在Emulator上工作，但通过使用VPN连接到Windows 7 PC上运行的Socket服务器，手机上会发生“IOException”

VPN网络已在手机中成功建立，甚至手机中安装的一些“PING”工具也会对运行Socket Server程序的PC IP进行PING

android代码中出现此错误的部分如下所示

class CreateSocketClientThread implements Runnable {
    @Override
    public void run() {
        try {
            InetAddress server_addr = InetAddress.getByName("10.51.100.100");
            socket = new Socket();
            InetSocketAddress inetsocketaddress = new InetSocketAddress(server_addr, 9900);
            socket.connect(inetsocketaddress, 5000);
            Log.d("debug", "Connected to Socket Server '" + socket.getInetAddress().getHostName() + " : " + socket.getPort() + "'");
            updateConversationHandler.post(new updateUIThread1("Connection Established !"));

        } catch (UnknownHostException e1) {
            Log.d("debug", "unknown host: " + e1.getMessage());
            updateConversationHandler.post(new updateUIThread1("Unknown Host error !"));
            //e1.printStackTrace();
        } catch (IOException e1) {
            Log.d("debug", "I/O error: " + e1.getMessage());
            updateConversationHandler.post(new updateUIThread1("I/O error !"));
            //e1.printStackTrace();
        } catch (Exception e1) {
            Log.d("debug", "Exception error: " + e1.getMessage());
            updateConversationHandler.post(new updateUIThread1("Exception error !"));
            //e.printStackTrace();
        }
    }
}

我还启用了internet权限

    <uses-permission android:name="android.permission.INTERNET" >
    </uses-permission>

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" >

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哪一个例外？您应该发布日志“android代码中出现此错误的部分”。你应该准确地说出哪个语句。04-17 15:42:54.070 4948-4948/com.nmithun.socketcommclient D/mithun﹕ Fn:openSocketConnection 04-17 15:42:59.090 4948-5037/com.nmithun.socketcommclient D/mithun﹕ I/O错误：在5000ms之后无法连接到/10.55.111.28端口9900。您应该确切地说出哪条语句。我重复一遍。您好，greenapps，错误发生在代码行“socket.connectionNetSocketAddress，5000；”因此，它执行“catch IOException e1”语句。