diff --git a/Implementation/chatapp/build/tmp/compileJava/source-classes-mapping.txt b/Implementation/chatapp/build/tmp/compileJava/source-classes-mapping.txt
index acaf915..1c6d54d 100644
--- a/Implementation/chatapp/build/tmp/compileJava/source-classes-mapping.txt
+++ b/Implementation/chatapp/build/tmp/compileJava/source-classes-mapping.txt
@@ -13,14 +13,15 @@ chatapp/Protocol/RunnerEcouteTCP.java
 chatapp/View/FenetreSession.java
  chatapp.View.FenetreSession
  chatapp.View.FenetreSession$1
-chatapp/Protocol/HttpEchange.java
- chatapp.Protocol.HttpEchange
+chatapp/Controller/ChatApp.java
+ chatapp.Controller.ChatApp
 chatapp/View/ChangementPseudo.java
  chatapp.View.ChangementPseudo
-chatapp/View/View_Menu.java
- chatapp.View.View_Menu
-chatapp/View/DemarrerSession.java
- chatapp.View.DemarrerSession
+chatapp/Protocol/RunnerEcouteUDP.java
+ chatapp.Protocol.RunnerEcouteUDP
+chatapp/Protocol/UDPEchange.java
+ chatapp.Protocol.RunnerUDP
+ chatapp.Protocol.UDPEchange
 chatapp/Main.java
  chatapp.Main
 chatapp/View/Clavardage.java
@@ -32,10 +33,9 @@ chatapp/View/ConnexionScreen.java
  chatapp.View.ConnexionScreen
 chatapp/View/View_Utilisateurs.java
  chatapp.View.View_Utilisateurs
-chatapp/Protocol/UDPEchange.java
- chatapp.Protocol.RunnerUDP
- chatapp.Protocol.UDPEchange
-chatapp/Controller/ChatApp.java
- chatapp.Controller.ChatApp
-chatapp/Protocol/RunnerEcouteUDP.java
- chatapp.Protocol.RunnerEcouteUDP
+chatapp/View/View_Menu.java
+ chatapp.View.View_Menu
+chatapp/Protocol/HttpEchange.java
+ chatapp.Protocol.HttpEchange
+chatapp/View/DemarrerSession.java
+ chatapp.View.DemarrerSession
diff --git a/Implementation/chatapp/src/main/java/chatapp/Controller/ChatApp.java b/Implementation/chatapp/src/main/java/chatapp/Controller/ChatApp.java
index 1ec0daf..c07ccd2 100644
--- a/Implementation/chatapp/src/main/java/chatapp/Controller/ChatApp.java
+++ b/Implementation/chatapp/src/main/java/chatapp/Controller/ChatApp.java
@@ -110,7 +110,24 @@ public class ChatApp implements PropertyChangeListener {
      * @return False si modiferPseudo a echoue, True sinon
      */
     private boolean modifierPseudoExterne(String nouveau) {
-        return false;
+        boolean reussi = false;
+        try {
+            if(externeEchange.sendPost("Pseudo " + nouveau)){
+                reussi = true ;
+                this.getMe().setPseudo(nouveau);
+                db.majPseudo(this.me.getId(),nouveau);
+                System.out.println("Changement pseudo accepte, nouvelle liste des utilisateurs actifs:");
+                this.getActifUsers().afficherListeUtilisateurs();
+            }
+            else{
+                System.out.println("Echec changement de pseudo");
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        return reussi;
     }
 
     /**
@@ -183,7 +200,15 @@ public class ChatApp implements PropertyChangeListener {
      */
     private boolean connexionExterne(String pseudo) throws IOException, InterruptedException{
         this.me.setPseudo(pseudo);
-        return externeEchange.sendPost("Connexion");
+        if(externeEchange.sendPost("Connexion")){
+            this.connecte=true;
+            this.db.ajoutUtilisateurs(this.me.getId(),pseudo);
+            this.db.majUtilisateursActifs(true,this.me.getId());
+            return true;
+        }
+        else{
+            return false;
+        }
     }
 
 
@@ -214,7 +239,7 @@ public class ChatApp implements PropertyChangeListener {
         else
         {
             System.out.println("Connexion echoue");
-            UDPEchange.setConnecte(false);
+            UDPEchange.setConnecte(true);
             return false ;
         }
     }
@@ -265,8 +290,31 @@ public class ChatApp implements PropertyChangeListener {
      * Il va prevenir le serveur de presence de son depart.</p>
      *
      */
-    private void deconnexionExterne() {
+    private void deconnexionExterne() throws IOException{
         // A IMPLEMENTER
+        System.out.println("Deco lancee");
+        boolean deco = false;
+        try {
+            deco = externeEchange.sendPost("Deconnexion");
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        if(deco){
+            System.out.print("Deconnexion reussie");
+        }
+        else{
+            System.out.println("Deconnexion echouee");
+        }
+        db.majUtilisateursActifs(false,this.me.getId());
+        this.connecte=false;
+        try {
+            main.stop();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        Platform.exit();
+        System.exit(0);
+
     }
 
 
diff --git a/Implementation/chatapp/src/main/java/chatapp/Protocol/HttpEchange.java b/Implementation/chatapp/src/main/java/chatapp/Protocol/HttpEchange.java
index 396bad2..c89d43a 100644
--- a/Implementation/chatapp/src/main/java/chatapp/Protocol/HttpEchange.java
+++ b/Implementation/chatapp/src/main/java/chatapp/Protocol/HttpEchange.java
@@ -37,6 +37,7 @@ public class HttpEchange {
      */
     public boolean sendPost(String type)  throws IOException, InterruptedException{
         boolean reussi = false ;
+        /*---------------------------------CONNEXION---------------------------------*/
         if (type.equals("Connexion")){
             System.out.println("Tentative de connexion distante");
             HttpClient client = HttpClient.newHttpClient();
@@ -63,6 +64,60 @@ public class HttpEchange {
                 }
             }
         }
+        /*---------------------------------DECONNEXION---------------------------------*/
+        else if(type.equals("Deconnexion")){
+            System.out.println("Tentative de deconnexion distante");
+            HttpClient client = HttpClient.newHttpClient();
+            String requestBody = "Deconnexion\n" + this.chatapp.getMe().toString() ;
+            HttpRequest request = HttpRequest.newBuilder()
+                    .uri(URI.create(url))
+                    .POST(HttpRequest.BodyPublishers.ofString(requestBody))
+                    .build();
+
+            HttpResponse<String> response = client.send(request,
+                    HttpResponse.BodyHandlers.ofString());
+
+            if(response.body().equals("")){
+                System.out.println("Reponse recue vide");
+            }
+            else {
+                System.out.println(response.body());
+                if(response.body().contains("Deconnexion")){
+                    reussi = true;
+                    System.out.println("Deconnexion acceptee");
+                }
+            }
+        }
+        /*---------------------------------PSEUDO---------------------------------*/
+        /*---------------------------Le nouveau pseudo----------------------------*/
+        else if(type.contains("Pseudo")){
+            String nouveau = type.split(" ")[1];
+            System.out.println("Tentative de modification de pseudo d'un hote distant");
+            HttpClient client = HttpClient.newHttpClient();
+            String requestBody = "Pseudo\n" + this.chatapp.getMe().toString() + "\n" + nouveau;
+            HttpRequest request = HttpRequest.newBuilder()
+                    .uri(URI.create(url))
+                    .POST(HttpRequest.BodyPublishers.ofString(requestBody))
+                    .build();
+
+            HttpResponse<String> response = client.send(request,
+                    HttpResponse.BodyHandlers.ofString());
+
+            if(response.body().equals("")){
+                System.out.println("Reponse recue vide");
+            }
+            else {
+                System.out.println(response.body());
+                switch (response.body().split("\n")[0]) {
+                    case "Reponse Pseudo":
+                        reussi = Boolean.parseBoolean(response.body().split("\n")[1]);
+                        System.out.println("Connexion acceptee");
+                        break;
+                    default:
+                        System.out.println("Erreur dans le format de la réponse reçue");
+                }
+            }
+        }
         else{
             System.out.println("Erreur de type");
         }
diff --git a/Implementation/chatapp/src/main/java/chatapp/Protocol/UDPEchange.java b/Implementation/chatapp/src/main/java/chatapp/Protocol/UDPEchange.java
index d0c8aac..7c7ab81 100644
--- a/Implementation/chatapp/src/main/java/chatapp/Protocol/UDPEchange.java
+++ b/Implementation/chatapp/src/main/java/chatapp/Protocol/UDPEchange.java
@@ -24,7 +24,7 @@ import chatapp.Model.*;
  */
 public class UDPEchange {
 
-    private static Boolean Connecte = false;
+    private static Boolean Connecte = true;
     // True si l'utilisateur peut se connecter avec ce nom d'utilisateur , False sinon
 
     private static Boolean EcouteEnCours = false;
@@ -160,7 +160,7 @@ public class UDPEchange {
      * @param Message correspond au message à transmettre a l'utilisateur
      */
     public static void envoiUnicast( InetAddress Adress , String Message ) throws IOException {
-        if (UDPEchange.getConnecte()){
+        if (ChatApp.getInstance().isConnecte()){
             DatagramSocket socket = new DatagramSocket();
             byte[]buffer = Message.getBytes();
             DatagramPacket packet = new DatagramPacket( buffer, buffer.length,  Adress, 1234 );
@@ -249,7 +249,7 @@ class RunnerUDP implements Runnable {
                     reponse += "false\n";
                 }
                 else {
-                    if(! u.getPseudo().equals("root")){
+                    if(!u.getPseudo().equals("root")){
                         System.out.println("Ajout d'un nouvel utilisateur dans la liste des Utilisateurs");
                         ( app.getActifUsers() ).addList(u);
                         reponse += "true\n";
@@ -279,7 +279,7 @@ class RunnerUDP implements Runnable {
                 Utilisateur u =  Utilisateur.stringToUtilisateur(received.split("\n")[2]);
                 app.getActifUsers().addList(u);
                 app.getActifUsers().afficherListeUtilisateurs();
-                UDPEchange.setConnecte(true);
+
             }
             else {
                 System.out.println("Pseudo deja pris");