diff --git a/chatdialog.cpp b/chatdialog.cpp
index 7ed7cfd..6fdc657 100644
--- a/chatdialog.cpp
+++ b/chatdialog.cpp
@@ -55,7 +55,7 @@
   connect(lineEdit, SIGNAL(returnPressed()), this, SLOT(returnPressed()));
   connect(setButton, SIGNAL(pressed()), this, SLOT(buttonPressed()));
   connect(treeButton, SIGNAL(pressed()), this, SLOT(treeButtonPressed()));
-  connect(refreshButton, SIGNAL(pressed()), this, SLOT(updateLocalPrefix()));
+  connect(refreshButton, SIGNAL(pressed()), this, SLOT(getLocalPrefix()));
   connect(this, SIGNAL(dataReceived(QString, const char *, size_t, bool, bool)), this, SLOT(processData(QString, const char *, size_t, bool, bool)));
   connect(this, SIGNAL(treeUpdated(const std::vector<Sync::MissingDataInfo>)), this, SLOT(processTreeUpdate(const std::vector<Sync::MissingDataInfo>)));
   connect(m_timer, SIGNAL(timeout()), this, SLOT(replot()));
@@ -76,6 +76,7 @@
                                        bind(&ChatDialog::processRemoveWrapper, this, _1));
       Sync::CcnxWrapperPtr handle = Sync::CcnxWrapper::Create();
       handle->setInterestFilter(m_user.getPrefix().toStdString(), bind(&ChatDialog::respondHistoryRequest, this, _1));
+      QTimer::singleShot(100, this, SLOT(getLocalPrefix()));
 
       QTimer::singleShot(600, this, SLOT(sendJoin()));
       m_timer->start(FRESHNESS * 1000);
@@ -546,42 +547,60 @@
   return randStr.c_str();
 }
 
-QString
+void
 ChatDialog::getLocalPrefix()
 {
+//   /* 
+//    * this method tries to use ccncat 
+//    * however, it does not work in Mac OS X app bundle
+//    * it works well in command line though
+//    */
+
+//   std::string cmd = CCN_EXEC;
+//   cmd += " -c -v ";
+//   cmd += LOCAL_PREFIX_QUERY;
+//   QString localPrefix;
+// #define MAX_PREFIX_LEN 100
+//   FILE *fp = popen(cmd.c_str(), "r");
+//   if (fp != NULL)
+//   {
+//     char prefix[MAX_PREFIX_LEN];
+//     if (fgets(prefix, MAX_PREFIX_LEN, fp) != NULL)
+//     {
+//       localPrefix = prefix;
+//       localPrefix.remove('\n');
+//     }
+//     else
+//     {
+//       localPrefix = DEFAULT_LOCAL_PREFIX;
+//     }
+//     pclose(fp);
+//   }
+//   else
+//   {
+//     localPrefix = DEFAULT_LOCAL_PREFIX;
+//   }
+//   return localPrefix;
   std::cerr << "trying to get local prefix" << std::endl;
   
-  try
-  {
-    Sync::CcnxWrapperPtr handle = Sync::CcnxWrapper::Create();
-    QString originPrefix = QString::fromStdString (handle->getLocalPrefix()).trimmed ();
-    std::cerr << "got: " << originPrefix.toStdString () << std::endl;
-
-    if (originPrefix != "" && m_user.getOriginPrefix () != originPrefix)
-      {
-        // emit settingUpdated(m_user.getNick (), m_user.getChatroom (), originPrefix);
-        return originPrefix;
-      }
-    else
+  if (m_sock != NULL)
     {
-      return DEFAULT_LOCAL_PREFIX;
-    }
-  }
-  catch (Sync::CcnxOperationException ex)
-  {
-    QMessageBox::critical(this, tr("Chronos"), tr("Canno connect to ccnd.\n Have you started your ccnd?"), QMessageBox::Ok);
-    std::exit(1);
-  }
-}
+      std::cerr << "trying to get local prefix2" << std::endl;
+      QString originPrefix = QString::fromStdString (m_sock->getLocalPrefix()).trimmed ();
+      std::cerr << "got: " << originPrefix.toStdString () << std::endl;
 
-void 
-ChatDialog::updateLocalPrefix()
-{
-  QString localPrefix = getLocalPrefix();
-  if (localPrefix != m_user.getOriginPrefix())
-  {
-    emit settingUpdated(m_user.getNick(), m_user.getChatroom(), localPrefix);
-  }
+      if (originPrefix != "" && m_user.getOriginPrefix () != originPrefix)
+        {
+          // m_user.setOriginPrefix(originPrefix);
+          emit settingUpdated(m_user.getNick (), m_user.getChatroom (), originPrefix);
+          // connect(&dialog, SIGNAL(updated(QString, QString, QString)), this, SLOT());
+        }
+    }
+  else
+    {
+      std::cerr << "socket is not availble" << std::endl;
+      // QTimer::singleShot(1000, this, SLOT(getLocalPrefix())); // try again
+    }
 }
 
 bool
@@ -590,9 +609,13 @@
   QSettings s(ORGANIZATION, APPLICATION);
   QString nick = s.value("nick", "").toString();
   QString chatroom = s.value("chatroom", "").toString();
+  // QString originPrefix = s.value("originPrefix", "").toString();
 
+  // Sync::CcnxWrapperPtr wrapper = Sync::CcnxWrapper::Create ();
+  // QString originPrefix = QString::fromStdString (wrapper->getLocalPrefix());
+  // Sync::CcnxWrapper::Destroy ();
   
-  QString originPrefix = getLocalPrefix();
+  QString originPrefix = DEFAULT_LOCAL_PREFIX;
   
   m_minimaniho = s.value("minimaniho", false).toBool();
   if (nick == "" || chatroom == "" || originPrefix == "") {
@@ -672,9 +695,6 @@
     std::cerr << "Errrrr.. msg was not probally initialized "<<__FILE__ <<":"<<__LINE__<<". what is happening?" << std::endl;
     abort();
   }
-#ifdef __DEBUG
-  std::cout << "Sending message for " << msg.from() << " prefix = " << m_user.getPrefix().toStdString() << std::endl;
-#endif
   m_sock->publishRaw(m_user.getPrefix().toStdString(), m_session, buf, size, FRESHNESS);
 
   delete buf;
@@ -695,9 +715,6 @@
 void 
 ChatDialog::sendJoin()
 {
-#ifdef __DEBUG
-  std::cout << "Sending join for " << m_user.getPrefix().toStdString() << std::endl;
-#endif
   SyncDemo::ChatMessage msg;
   formControlMessage(msg, SyncDemo::ChatMessage::JOIN);
   sendMsg(msg);
diff --git a/chatdialog.h b/chatdialog.h
index 8e09749..f0c58c2 100644
--- a/chatdialog.h
+++ b/chatdialog.h
@@ -47,7 +47,6 @@
   void processRemove(QString);
 
 private:
-  QString getLocalPrefix();
   void fetchHistory(std::string name);
   QString getRandomString();
   void formChatMessage(const QString &text, SyncDemo::ChatMessage &msg);
@@ -78,7 +77,8 @@
   void replot();
   void updateRosterList(QStringList);
   void enableTreeDisplay();
-  void updateLocalPrefix();
+  void getLocalPrefix();
+
   // icon related
   void iconActivated(QSystemTrayIcon::ActivationReason reason);
   void showMessage(QString, QString);
diff --git a/digesttreescene.cpp b/digesttreescene.cpp
index 403610e..64f6949 100644
--- a/digesttreescene.cpp
+++ b/digesttreescene.cpp
@@ -33,9 +33,6 @@
       p->setPrefix(v[i].prefix.c_str());
       p->setSeq(v[i].high);
       m_roster.insert(p->getPrefix(), p);
-#ifdef __DEBUG
-      std::cout << "<<<<<<< Adding user. Prefix = " << p->getPrefix().toStdString() << std::endl;
-#endif
     }
     else 
     {
@@ -94,9 +91,6 @@
 void
 DigestTreeScene::msgReceived(QString prefix, QString nick)
 {
-#ifdef __DEBUG
-  std::cout << "<<<<<<< MsgReceived. Prefix = " << prefix.toStdString() << ". Nick = " << nick.toStdString() << std::endl;
-#endif
   Roster_iterator it = m_roster.find(prefix);
   if (it != m_roster.end()) 
   {