--- a/src/main/java/com/glavsoft/rfb/protocol/ProtocolContext.java	Tue May 27 00:12:55 2014 +0900
+++ b/src/main/java/com/glavsoft/rfb/protocol/ProtocolContext.java	Thu Jun 05 17:01:34 2014 +0900
@@ -75,5 +75,20 @@
     void resetDecoder();
 
     void stopReceiverTask();
+    
+    /**
+     * TreeVNC expension command (server to client)
+     * 0   : command byte
+     * 1-3 : padding
+     * 4   : length U32
+     * length : text
+     * 
+     */
+    public static final int	FIND_ROOT = 220;
+    public static final int	FIND_ROOT_REPLY  = 221;
+    public static final int WHERE_TO_CONNECT = 222; 
+    public static final int CONNECT_TO = 223;
+    public static final int	LOST_PARENT = 224;
+    
 	
 }

--- a/src/main/java/jp/ac/u_ryukyu/treevnc/MyRfbProto.java	Tue May 27 00:12:55 2014 +0900
+++ b/src/main/java/jp/ac/u_ryukyu/treevnc/MyRfbProto.java	Thu Jun 05 17:01:34 2014 +0900
@@ -1,6 +1,7 @@
 package jp.ac.u_ryukyu.treevnc;
 
 import java.io.IOException;
+
 import java.io.OutputStream;
 import java.net.BindException;
 import java.net.ServerSocket;
@@ -26,6 +27,7 @@
 import com.glavsoft.transport.Writer;
 import com.glavsoft.viewer.ViewerImpl;
 
+
 public abstract class MyRfbProto {
 	final static int FramebufferUpdateRequest = 3;
 	final static int CheckDelay = 11;
@@ -61,11 +63,43 @@
 
 	abstract public boolean isRoot() ;
 	
+	public boolean initialConnection(final Writer os, final Reader is)
+			throws IOException, TransportException {
+		/**
+		 * initial connection of RFB protocol
+		 */
+		sendRfbVersion(os);
+		byte[] b;
+		if ((b = readVersionMsg(is, os))!=null) {
+			treeVncCommand(b,is,os);
+			return true;
+		}
+		sendSecurityType(os);
+		readSecType(is);
+		sendSecResult(os);
+		readClientInit(is);
+		sendInitData(os);
+		return false;
+	}
+	
+	private void treeVncCommand(byte[] b, Reader is, Writer os) {
+		ByteBuffer buf = ByteBuffer.wrap(b);
+		int command = buf.get();
+
+		switch (command) {
+		case ProtocolContext.FIND_ROOT : 
+		case ProtocolContext.WHERE_TO_CONNECT : 
+		case ProtocolContext.LOST_PARENT :
+			System.out.println("get treeVNC command" + command);
+		}
+	}
+
 	public void newClient(AcceptThread acceptThread, final Socket newCli,
-			final Writer os, final Reader is) throws IOException {
-		// createBimgFlag = true;
-		// rfb.addSockTmp(newCli);
-		// addSock(newCli);
+			final Writer os, final Reader is) throws IOException, TransportException {
+
+		
+		if (initialConnection(os, is)) return; // 
+			
 		final int myId = clients;
 		final MulticastQueue.Client<LinkedList<ByteBuffer>> c = multicastqueue.newClient();
 		final AtomicInteger writerRunning = new AtomicInteger();
@@ -177,17 +211,9 @@
 				try {
 					requestThreadNotify();
 
-					/**
-					 * initial connection of RFB protocol
-					 */
-					sendRfbVersion(os);
-					// readVersionMsg(is);
-					readVersionMsg(is, os);
-					sendSecurityType(os);
-					readSecType(is);
-					sendSecResult(os);
-					readClientInit(is);
-					sendInitData(os);
+
+					
+					
 					// after this, we discard upward packet.
 					new Thread(reader, "discard-upward-comm").start(); 
 					// writeFramebufferUpdateRequest(0,0, framebufferWidth,
@@ -255,12 +281,13 @@
 		writer.write(versionMsg_3_856.getBytes());
 	}
 	
-	private int readVersionMsg(Reader reader, Writer writer) throws IOException, TransportException {
+	private byte[] readVersionMsg(Reader reader, Writer writer) throws IOException, TransportException {
 
 		byte[] b = new byte[12];
 
 		reader.readBytes(b);
 
+		if (b[0]>=220) return b; // TreeVNC extention command.
 		if ((b[0] != 'R') || (b[1] != 'F') || (b[2] != 'B') || (b[3] != ' ')
 				|| (b[4] < '0') || (b[4] > '9') || (b[5] < '0') || (b[5] > '9')
 				|| (b[6] < '0') || (b[6] > '9') || (b[7] != '.')
@@ -282,7 +309,7 @@
 			if (proxyFlag)
 				sendPortNumber(writer);
 		}
-		return rfbMinor;
+		return null;
 	}
 		
 	
@@ -677,4 +704,6 @@
         // But we have do inflation for all input data, so we have to do it
         // here.
     }
+
+
 }

--- a/src/viewer_swing/java/com/glavsoft/viewer/swing/ConnectionParams.java	Tue May 27 00:12:55 2014 +0900
+++ b/src/viewer_swing/java/com/glavsoft/viewer/swing/ConnectionParams.java	Thu Jun 05 17:01:34 2014 +0900
@@ -33,7 +33,7 @@
 public class ConnectionParams implements Model {
 	public static final int DEFAULT_SSH_PORT = 22;
 	public static final int DEFAULT_RFB_PORT = 5900;
-	public static final int DEFAULT_VNC_ROOT_FINDER = 8182;
+	public static final int DEFAULT_VNC_ROOT_FINDER = DEFAULT_RFB_PORT;
 
 	public String hostName;
 	private int portNumber;