--- a/src/main/java/com/glavsoft/rfb/client/ClientToServerMessage.java	Tue Nov 04 04:21:56 2014 +0900
+++ b/src/main/java/com/glavsoft/rfb/client/ClientToServerMessage.java	Tue Nov 11 05:30:56 2014 +0900
@@ -35,7 +35,7 @@
 	byte POINTER_EVENT = 5;
 	byte CLIENT_CUT_TEXT = 6;
 	byte SERVER_CHANGE_REQUEST = (byte) 240; // TreeVNC extension
-	byte CHECK_DELAY_REPLY = 7;
+	byte CHECK_DELAY_REPLY = 70;
 
 	void send(Writer writer) throws TransportException;
 }

--- a/src/main/java/jp/ac/u_ryukyu/treevnc/TreeManagement.java	Tue Nov 04 04:21:56 2014 +0900
+++ b/src/main/java/jp/ac/u_ryukyu/treevnc/TreeManagement.java	Tue Nov 11 05:30:56 2014 +0900
@@ -84,7 +84,12 @@
         me.setHostName(myHostName);
         if (deadParent.getTreeNum() == 0) {
             // if dead root, connect me.
-            connectTo(me, lostParentNode);
+            try {
+                connectTo(me, lostParentNode);
+            } catch (IOException e) {
+                System.out.println("root to lostParentNode Connection Faild (lostParent)");
+                System.exit(0);
+            }
             return;
         }
         if (getChildNode(deadParent, 0) == null) return;
@@ -102,12 +107,25 @@
         TreeVNCNode newparent = nodeList.get(oldParent.getTreeNum());
         TreeVNCNode grandfather = getParentNode(newparent.getTreeNum());
 
-        connectTo(grandfather, newparent);
+        try {
+            connectTo(grandfather, newparent);
+        } catch (IOException e) {
+            System.out.println("grandfather to newparent Connection Faild (lostParent)");
+            System.out.println("try lostNodeParent again.");
+            if(getChildNode(newparent, 0) == null) return;
+            moveLastNodeToLostNodePosition(newparent.getTreeNum());
+            lostNodeConnection(newparent);
+        }
 
         for(int i=0; i < treebranch; i++) {
             TreeVNCNode child = getChildNode(newparent, i);
             if (child != null) {
-                connectTo(newparent, child);
+                try {
+                    connectTo(newparent, child);
+                } catch (IOException e) {
+                    System.out.println("newparent to child Connection Faild (lostParent)");
+                    System.exit(0);
+                }
             }
         }
 
@@ -118,18 +136,10 @@
 
 
 
-    public void connectTo(TreeVNCNode newparent, TreeVNCNode n) {
+    public void connectTo(TreeVNCNode newparent, TreeVNCNode n) throws IOException {
         TreeVncProtocol vc1 = new TreeVncProtocol(n.getHostname(),n.getPort());
-        try {
             short nodeId = (short) n.getTreeNum();
             vc1.connectTo(newparent.getHostname(), newparent.getPort(), isLeader(n), nodeId);
-        } catch (IOException e) {
-            // log
-            System.out.println("can't connectTo : port = " + n.getPort() + ", addr = " + n.getHostname());
-            if (getChildNode(n, 0) == null) return;
-            moveLastNodeToLostNodePosition(n.getTreeNum());
-            lostNodeConnection(n);
-        }
     }
 
     private int isLeader(TreeVNCNode n) {
@@ -156,12 +166,22 @@
         if (nodeList.size() >= treebranch + 1) {
             TreeVNCNode parent = getParentNode(node.getTreeNum());
             checkParameter(parent.getTreeNum(), nodeList.size(), isLeader(node));
-            connectTo(parent, node);
+            try {
+                connectTo(parent, node);
+            } catch (IOException e) {
+                System.out.println("parent : Connection Faild (decideWhereToConnect)");
+                System.exit(0);
+            }
         } else {
             // connect to me
             TreeVNCNode me = nodeList.getFirst();
             me.setHostName(localhostname);
-            connectTo(me, node);
+            try {
+                connectTo(me, node);
+            } catch (IOException e) {
+                System.out.println("root : Connection Faild (decideWhereToConnect)");
+                System.exit(0);
+            }
         }
         if (showTreeNode) {
             showTreeNode();