diff --git a/src/main/webapp/assets/modules/common/cleanup.fac.js b/src/main/webapp/assets/modules/common/cleanup.fac.js
index 653ae1b4e..fcdb384b1 100644
--- a/src/main/webapp/assets/modules/common/cleanup.fac.js
+++ b/src/main/webapp/assets/modules/common/cleanup.fac.js
@@ -12,6 +12,12 @@ angular.module("Common").factory("cleanupFactory", function (jsonValue, utils, l
     cleanSession: function () {
       $rootScope.userInfo = undefined;
       localStorageService.cookie.remove(jsonValue.storage.key);
+    },
+
+    cleanBack2Me: function() {
+      if (utils.getView() !== jsonValue.views.signIn) {
+        localStorageService.remove(jsonValue.storage.back2Me);
+      }
     }
   }
 
@@ -23,5 +29,6 @@ angular.module("Common").factory("cleanupFactory", function (jsonValue, utils, l
   utils.registerNotification(jsonValue.notifications.cleanSession, $$.cleanSession);
   utils.registerNotification(jsonValue.notifications.loginFailed, $$.cleanSession);
   utils.registerNotification(jsonValue.notifications.logoutSuccess, $$.cleanSession);
+  utils.registerNotification(jsonValue.notifications.changeUrl, $$.cleanBack2Me);
   return instance;
 });
\ No newline at end of file
diff --git a/src/main/webapp/assets/modules/common/connection.fac.js b/src/main/webapp/assets/modules/common/connection.fac.js
index 4e82f25a6..edbb1933c 100644
--- a/src/main/webapp/assets/modules/common/connection.fac.js
+++ b/src/main/webapp/assets/modules/common/connection.fac.js
@@ -61,7 +61,6 @@ angular.module("Common").factory("connectionFactory",
           localStorageService.set(jsonValue.storage.back2Me, "true");
           return utils.sendNotification(jsonValue.notifications.loginFailed);
         }
-        return utils.sendNotification(jsonValue.notifications.http404);
       }
     }
 
@@ -101,7 +100,6 @@ angular.module("Common").factory("connectionFactory",
             utils.sendNotification(jsonValue.notifications.userInfo, userInfo);
           })
           .catch(function() {
-            //localStorageService.set(jsonValue.storage.back2Me, "true");
             utils.sendNotification(jsonValue.notifications.notUserInfo);
           });
 
diff --git a/src/main/webapp/assets/modules/common/history.fac.js b/src/main/webapp/assets/modules/common/history.fac.js
index 9eb08c5e8..be3954400 100644
--- a/src/main/webapp/assets/modules/common/history.fac.js
+++ b/src/main/webapp/assets/modules/common/history.fac.js
@@ -1,6 +1,6 @@
 angular.module("Common").factory("historyFactory", function (jsonValue, $location, $rootScope, utils) {
   var historyStack = [];
-  //var exceptViews = [jsonValue.views.analyticsSkill, jsonValue.views.signIn];
+  var exceptViews = [jsonValue.views.analyticsSkill, jsonValue.views.signIn];
 
   $rootScope.$on('$routeChangeSuccess', function (event, next, current) {
     switch (utils.getView()) {
@@ -8,9 +8,8 @@ angular.module("Common").factory("historyFactory", function (jsonValue, $locatio
       case jsonValue.views.pieChart:
         // TODO: #1 - change the body background to black
         $("body").css("background-color", "#201d1e");
-        instance.trackHistory();
     }
-    console.log(historyStack);
+    instance.trackHistory();
 
     utils.sendNotification(jsonValue.notifications.changeUrl/*, current.$$route.originalPath, next.$$route.originalPath*/);
   });
@@ -25,8 +24,9 @@ angular.module("Common").factory("historyFactory", function (jsonValue, $locatio
     },
 
     popHistory: function () {
-      //var url; // remove current item
-      //do {url = historyStack.pop()} while(exceptViews.indexOf(url) >= 0);
+      var url; // remove current item
+      do {url = historyStack.pop()} while(exceptViews.indexOf(url) >= 0);
+      console.log(historyStack);
       //if (historyStack.length === 0) return "/";
       //return historyStack.pop();
       switch (utils.getView()) {
diff --git a/src/main/webapp/assets/modules/common/router.ser.js b/src/main/webapp/assets/modules/common/router.ser.js
index fa7f4475f..fd73d3af9 100644
--- a/src/main/webapp/assets/modules/common/router.ser.js
+++ b/src/main/webapp/assets/modules/common/router.ser.js
@@ -7,7 +7,6 @@ angular.module("Common").factory("routerService", function (jsonValue, utils, $l
 
     loginSuccess: function () {
       if (localStorageService.get(jsonValue.storage.back2Me) === "true") {
-        localStorageService.remove(jsonValue.storage.back2Me);
         var path = historyFactory.popHistory();
         $location.path(path);
       }
@@ -17,17 +16,11 @@ angular.module("Common").factory("routerService", function (jsonValue, utils, $l
     },
 
     serverError: function () {
-      //$location.path("/");
+      console.log("Unable to connect to server");
     },
 
     logoutSuccess: function() {
       $location.path("/");
-    },
-
-    changeUrl: function() {
-      if (utils.getView() !== jsonValue.views.signIn) {
-        localStorageService.remove(jsonValue.storage.back2Me);
-      }
     }
   }
 
@@ -35,7 +28,6 @@ angular.module("Common").factory("routerService", function (jsonValue, utils, $l
   utils.registerNotification(jsonValue.notifications.logoutSuccess, $$.logoutSuccess);
   utils.registerNotification(jsonValue.notifications.loginSuccess, $$.loginSuccess);
   utils.registerNotification(jsonValue.notifications.serverError, $$.serverError);
-  utils.registerNotification(jsonValue.notifications.changeUrl, $$.changeUrl);
 
   var instance = {
     initialize: function () {}
diff --git a/src/main/webapp/assets/modules/common/user.ser.js b/src/main/webapp/assets/modules/common/user.ser.js
index 223ae54cd..e0769d302 100644
--- a/src/main/webapp/assets/modules/common/user.ser.js
+++ b/src/main/webapp/assets/modules/common/user.ser.js
@@ -1,9 +1,25 @@
-angular.module("Common").factory("userService", function (jsonValue, utils, connectionFactory, $rootScope, $q) {
+angular.module("Common").factory("userService", function (jsonValue, utils, connectionFactory, $rootScope, $q, localStorageService, $cookies) {
 
   var defers = {
     getUserInfo: []
   }
 
+  var $$ = {
+    notUserInfo: function() {
+      $$.reject("getUserInfo");
+    },
+
+    reject: function (key, reply) {
+      $.each(defers[key], function (i, d) {d.reject(reply);});
+      defers[key].length = 0;
+    },
+
+    resolve: function (key, reply) {
+      $.each(defers[key], function (i, d) {d.resolve(reply);});
+      defers[key].length = 0;
+    }
+  }
+
   var instance = {
     initialize: function () {},
 
@@ -11,27 +27,35 @@ angular.module("Common").factory("userService", function (jsonValue, utils, conn
       var deferred = $q.defer();
       defers.getUserInfo.push(deferred);
 
-      if (instance.notLoggedIn()) {
+      if (!instance.verifyUserSession()) {
+        $$.notUserInfo();
+      }
+      else if (instance.notLoggedIn()) {
         connectionFactory.findUserInfoByKey();
       }
       else {
-        instance.resolve("getUserInfo", $rootScope.userInfo);
+        $$.resolve("getUserInfo", $rootScope.userInfo);
       }
       return deferred.promise;
     },
 
-    resolve: function (key, reply) {
-      $.each(defers[key], function (i, d) {d.resolve(reply);});
-      defers[key].length = 0;
-    },
-
-    //TODO: check actual user logged-in
     notLoggedIn: function () {
       return ($rootScope.userInfo === undefined);
+    },
+
+    verifyUserSession: function() {
+      return localStorageService.cookie.get(jsonValue.storage.key) !== null;
     }
   }
 
-  instance.getUserInfo(); //handle refresh button: read user-info
+  if (instance.verifyUserSession()) {
+    instance.getUserInfo(); //handle refresh button: read user-info
+  }
+  else {
+    utils.sendNotification(jsonValue.notifications.cleanSession);
+  }
+
+  utils.registerNotification(jsonValue.notifications.notUserInfo, $$.notUserInfo);
   utils.registerNotification(jsonValue.notifications.userInfo, instance.getUserInfo);
   return instance;
 });
\ No newline at end of file
diff --git a/src/main/webapp/assets/modules/register/register.con.js b/src/main/webapp/assets/modules/register/register.con.js
index ba9ad8ad7..984167fcb 100644
--- a/src/main/webapp/assets/modules/register/register.con.js
+++ b/src/main/webapp/assets/modules/register/register.con.js
@@ -5,9 +5,15 @@ angular.module('Register').controller('registerController',
     $scope.openOathDialog = registerService.openOathDialog;
     $scope.salaryOptions = registerService.getSalaryOptions();
 
-    userService.getUserInfo().then(function () {
-      utils.sendNotification(jsonValue.notifications.gotData);
-    });
+    userService.getUserInfo()
+      .then(function () {
+        localStorageService.remove(jsonValue.storage.back2Me, "true");
+        utils.sendNotification(jsonValue.notifications.gotData);
+      })
+      .catch(function () {
+        localStorageService.set(jsonValue.storage.back2Me, "true");
+        utils.sendNotification(jsonValue.notifications.loginFailed);
+      });
     navigationService.addSpaceforNavi();
     navigationService.reSetingPositionLangIcon();
     navigationService.keepNaviBar();
diff --git a/src/main/webapp/assets/modules/register/register.ser.js b/src/main/webapp/assets/modules/register/register.ser.js
index cc81d2757..8c4c01278 100644
--- a/src/main/webapp/assets/modules/register/register.ser.js
+++ b/src/main/webapp/assets/modules/register/register.ser.js
@@ -7,6 +7,7 @@ angular.module('Register').factory('registerService',
     var $$ = {
       initialize: function ($scope) {
         scope = $scope;
+
         $('input[type="checkbox"]').checkbox();
         $("#salary").slider({});
         $('.btn-close').click(function () {
@@ -46,10 +47,6 @@ angular.module('Register').factory('registerService',
 
       enableNotifications: function () {
         return utils.getView() === jsonValue.views.register;
-      },
-
-      notUserInfo: function() {
-        localStorageService.set(jsonValue.storage.back2Me, "true");
       }
     }
 
@@ -81,7 +78,7 @@ angular.module('Register').factory('registerService',
       }
     };
 
-    utils.registerNotification(jsonValue.notifications.notUserInfo, $$.notUserInfo, $$.enableNotifications);
+    //utils.registerNotification(jsonValue.notifications.notUserInfo, $$.notUserInfo, $$.enableNotifications);
     utils.registerNotification(jsonValue.notifications.switchScope, $$.initialize, $$.enableNotifications);
     return instance;
   });
\ No newline at end of file
diff --git a/src/main/webapp/assets/modules/signin/signin.ser.js b/src/main/webapp/assets/modules/signin/signin.ser.js
index 26e508fc3..35c8afd45 100644
--- a/src/main/webapp/assets/modules/signin/signin.ser.js
+++ b/src/main/webapp/assets/modules/signin/signin.ser.js
@@ -1,6 +1,6 @@
 angular.module('SignIn').factory('signInService',
   function (jsonValue, utils, shortcutFactory, $location, tourService, $auth, localStorageService,
-            $window, $http, connectionFactory, $rootScope) {
+            $window, $http, connectionFactory, $rootScope, userService) {
 
     var $$ = {
       enableNotifications: function () {
@@ -20,14 +20,14 @@ angular.module('SignIn').factory('signInService',
         utils.sendNotification(jsonValue.notifications.loading, $(window).height());
 
         // check if user already login
-        connectionFactory.verifyUserLogin()
-          .then(function() {
-            utils.sendNotification(jsonValue.notifications.loginSuccess);
-          })
-          .catch(function() {
-            $rootScope.userInfo = undefined;
-            utils.sendNotification(jsonValue.notifications.loaded);
-          });
+        if (userService.verifyUserSession()) {
+          connectionFactory.verifyUserLogin()
+            .then(function () {utils.sendNotification(jsonValue.notifications.loginSuccess);})
+            .catch(function () {utils.sendNotification(jsonValue.notifications.loginFailed);});
+        }
+        else {
+          utils.sendNotification(jsonValue.notifications.hideLoadingBox);
+        }
 
         $('.signin-accounts').parallax();