diff --git a/ComApp/src/App/Views/LoginScreen.js b/ComApp/src/App/Views/LoginScreen.js
index f44d302..eb0d15b 100644
--- a/ComApp/src/App/Views/LoginScreen.js
+++ b/ComApp/src/App/Views/LoginScreen.js
@@ -22,7 +22,8 @@ import * as FileSystem from 'expo-file-system';
 // Controller
 import LoginController from '../Controllers/LoginController';
 // Database
-import { Setting } from '../../Database';
+import { Setting, User } from '../../Database';
+import InstallController from '../Controllers/InstallController';
 import SyncController from '../Controllers/SyncController';
 
 function mapStateToProps(state) {
@@ -42,6 +43,7 @@ const mapDispatchToProps = dispatch => {
 
 class LoginScreen extends React.Component {
   state = {
+    syncWorking: false,
     login: '',
     password: '',
   };
@@ -51,6 +53,7 @@ class LoginScreen extends React.Component {
       this.props.setCurrentUser(false);
     }
     SplashScreen.hideAsync();
+    this.syncUsersIfPossibleAsync();
   }
 
   render() {
@@ -83,11 +86,12 @@ class LoginScreen extends React.Component {
               autoCorrect={false}
             />
             <Button
+              disabled={this.state.syncWorking}
               title={i18n.t('global.login')}
               onPress={() =>
                 this.login(this.state.login.toLowerCase(), this.state.password)
               }
-              color={this.props.mainColor}
+              color={!this.state.syncWorking ? this.props.mainColor : 'gray'}
             />
           </View>
         </View>
@@ -123,11 +127,11 @@ class LoginScreen extends React.Component {
     }
     const isConnected = await SyncController.checkConnection()
       .then(state => {
-        //console.log(state.isConnected)
+        console.debug(state.isConnected);
         return state.isConnected;
       })
       .catch(error => {
-        //console.log(error);
+        console.debug(error);
         return false;
       });
     const lastUser = Setting.get('lastUser');
@@ -172,6 +176,35 @@ class LoginScreen extends React.Component {
     }
   }
 
+  async syncUsersIfPossibleAsync() {
+    const isConnected = await SyncController.checkConnection();
+    if (!isConnected.isInternetReachable) {
+      return;
+    }
+    this.setState({ syncWorking: true });
+    if (InstallController.getAppConfig(SyncController.getUrlBo())) {
+      // getUsers
+      const resUsers = await SyncController.getUsers()
+        .then(res => {
+          User.clear();
+          return res.data;
+        })
+        .catch(error => {
+          console.error(error);
+          Alert.alert(
+            i18n.t('error.error'),
+            i18n.t('error.error_has_occurred'),
+          );
+          this.setState({ syncWorking: false });
+          return;
+        });
+      resUsers.forEach(user => {
+        User.add(user);
+      });
+      this.setState({ syncWorking: false });
+    }
+  }
+
   loginAction(user) {
     this.setState({ login: '', password: '' });
     LoginController.login(user);
diff --git a/ComApp/src/App/Views/SyncScreen.js b/ComApp/src/App/Views/SyncScreen.js
index 4a9dc54..fdcff33 100644
--- a/ComApp/src/App/Views/SyncScreen.js
+++ b/ComApp/src/App/Views/SyncScreen.js
@@ -1,5 +1,5 @@
 import React from 'react';
-import { Alert, Button, Text, View } from 'react-native';
+import { Alert, Button, Linking, Text, View } from 'react-native';
 // Redux
 import { connect } from 'react-redux';
 import { initContact } from '../Store/Actions/contacts';