diff --git a/js/config.js b/js/config.js
index fa63467d..fafb8315 100644
--- a/js/config.js
+++ b/js/config.js
@@ -425,6 +425,9 @@ module.exports = {
     saveUserConfig,
     clearCachedConfigs,
     
-    readConfigFileSync
+    readConfigFileSync,
+
+    // use only if you specifically need to read global config fields
+    getGlobalConfigField,
 
 };
diff --git a/js/utils/isWhiteList.js b/js/utils/isWhiteList.js
index 4f76230b..a6a49899 100644
--- a/js/utils/isWhiteList.js
+++ b/js/utils/isWhiteList.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const { getConfigField } = require('./../config.js');
+const { getGlobalConfigField } = require('./../config.js');
 const parseDomain = require('parse-domain');
 const isEqual = require('lodash.isequal');
 
@@ -12,7 +12,7 @@ const isEqual = require('lodash.isequal');
 function isWhiteList(url) {
 
     return new Promise((resolve, reject) => {
-        getConfigField('whiteListURL').then((whiteList) => {
+        getGlobalConfigField('whiteListURL').then((whiteList) => {
 
             if (checkWhiteList(url, whiteList)) {
                 return resolve();
diff --git a/js/windowMgr.js b/js/windowMgr.js
index 1720fbca..2be46bc6 100644
--- a/js/windowMgr.js
+++ b/js/windowMgr.js
@@ -463,11 +463,18 @@ function doCreateMainWindow(initialUrl, initialBounds) {
         }
     });
 
-    mainWindow.webContents.on('will-navigate', function(event, navigatedUrl){
-        // TODO: need inputs from design to implement error dialog
-        isWhiteList(navigatedUrl).catch(() => {
-            event.preventDefault();
-        });
+    // whenever the main window is navigated for ex: window.location.href or url redirect
+    mainWindow.webContents.on('will-navigate', function(event, navigatedURL) {
+        isWhiteList(navigatedURL)
+            .catch(() => {
+                event.preventDefault();
+                electron.dialog.showMessageBox(mainWindow, {
+                    type: 'warning',
+                    buttons: [ 'Ok' ],
+                    title: 'Not Allowed',
+                    message: `Sorry, you are not allowed to access this website (${navigatedURL}), please contact your administrator for more details`,
+                });
+            });
     });
 
 }