diff --git a/app/src/main/java/lightcontainer/domains/Task.java b/app/src/main/java/lightcontainer/domains/Task.java
index e5e70d3..4a89b7b 100644
--- a/app/src/main/java/lightcontainer/domains/Task.java
+++ b/app/src/main/java/lightcontainer/domains/Task.java
@@ -77,4 +77,8 @@ public class Task {
     public Context getContext() {
         return this.context;
     }
+
+    public String getDomain() {
+        return context.getDomain();
+    }
 }
diff --git a/app/src/main/java/lightcontainer/domains/client/ClientHandler.java b/app/src/main/java/lightcontainer/domains/client/ClientHandler.java
index d10a544..3508101 100644
--- a/app/src/main/java/lightcontainer/domains/client/ClientHandler.java
+++ b/app/src/main/java/lightcontainer/domains/client/ClientHandler.java
@@ -115,16 +115,23 @@ public class ClientHandler implements Runnable, AutoCloseable {
                     ProtocolWriter.ProtocolResult writerCommand = ruleResult.getResultCommand();
 
                     if (ruleResult.getReceiver() == ProtocolReader.ResultCmdReceiver.STOREBACKEND) {
-                        fileFrontEnd.newCommand(context, writerCommand); // Envoie dans la file de tâche FileFrontEnd en attente d'un traitement d'un StorBackEnd
+                        // TODO : Vérifier que le StorBackEnd demandé (Pas toujours demandé) est disponible
+                        if (ruleResult.getRequestDomain() != null && !fileFrontEnd.canExecuteCommand(ruleResult.getRequestDomain())) {
+                            writer.print(ruleResult.onNotExecutable(context)); // Renvoie au client
+                            writer.flush();
+                        } else {
+                            fileFrontEnd.newCommand(context, writerCommand); // Envoie dans la file de tâche FileFrontEnd en attente d'un traitement d'un StorBackEnd
 
-                        // Attend la fin de la réalisation de la tâche
-                        waitTaskResponse();
+                            // Attend la fin de la réalisation de la tâche
+                            waitTaskResponse();
+
+                            writer.write(response.getCommand()); // Renvoie au client
+                            writer.flush();
+                            response.write(this.client.getOutputStream()); // Ecrit au client si nécessaire
+                        }
 
-                        writer.write(response.getCommand()); // Renvoye au client
-                        writer.flush();
-                        response.write(this.client.getOutputStream()); // Ecrit au client si nécessaire
                     } else {
-                        writer.print(writerCommand.getCommand()); // Renvoye au client
+                        writer.print(writerCommand.getCommand()); // Renvoie au client
                         writer.flush();
                     }
 
@@ -133,7 +140,6 @@ public class ClientHandler implements Runnable, AutoCloseable {
                     accessDenied();
                 }
             } catch (IOException e) {
-                e.printStackTrace();
                 repository.disconnect(this);
                 break;
             }
@@ -195,13 +201,13 @@ public class ClientHandler implements Runnable, AutoCloseable {
     /**
      * Vérifie s'il s'âgit d'une demande de déconnexion
      * @param ruleResult
-     */
     private void checkSignError(ProtocolWriter.ProtocolResult ruleResult) {
        if (ruleResult.getCommand().startsWith(SignErrorRule.NAME)) {
             System.out.println("Pas pu connecter");
             repository.disconnect(this);
         }
     }
+     */
 
     /**
      * Permet au Client d'attendre la fin de la réalisation de sa tâche
diff --git a/app/src/main/java/lightcontainer/domains/client/StoreProcessor.java b/app/src/main/java/lightcontainer/domains/client/StoreProcessor.java
index 47e2ca6..8fb1316 100644
--- a/app/src/main/java/lightcontainer/domains/client/StoreProcessor.java
+++ b/app/src/main/java/lightcontainer/domains/client/StoreProcessor.java
@@ -83,6 +83,10 @@ public class StoreProcessor extends Thread implements AutoCloseable {
         this.client_run = true;
         while (this.client_run) {
             try {
+                if (!store.isConnected()) {
+                    // TODO : Gérer déconnection
+                    break;
+                }
                 waitAction();
                 System.out.println("[SBE] Envoie commande : " + protocolResult.getCommand());
 
@@ -104,7 +108,9 @@ public class StoreProcessor extends Thread implements AutoCloseable {
 
                 alertAvalaible(responseResult.getResultCommand());
 
-            } catch (IOException ignore) { }
+            } catch (IOException ignore) {
+                // TODO : Gérer déconnection
+            }
         }
     }
 
@@ -153,6 +159,7 @@ public class StoreProcessor extends Thread implements AutoCloseable {
             try {
                 this.client_run = false;
                 this.store.close();
+                // TODO : Gérer déconnection (enlever du repo et prévenir client et FileFrontEnd)
             } catch (IOException ignored) { }
         }
     }
diff --git a/app/src/main/java/lightcontainer/interfaces/ClientHandlerFFE.java b/app/src/main/java/lightcontainer/interfaces/ClientHandlerFFE.java
index 2cd5c90..30b6b1a 100644
--- a/app/src/main/java/lightcontainer/interfaces/ClientHandlerFFE.java
+++ b/app/src/main/java/lightcontainer/interfaces/ClientHandlerFFE.java
@@ -18,4 +18,5 @@ public interface ClientHandlerFFE {
      */
     void newCommand(Context context, ProtocolWriter.ProtocolResult command);
 
+    boolean canExecuteCommand(String domain);
 }
diff --git a/app/src/main/java/lightcontainer/interfaces/MulticastSPR.java b/app/src/main/java/lightcontainer/interfaces/MulticastSPR.java
index 1d634c4..5f352e7 100644
--- a/app/src/main/java/lightcontainer/interfaces/MulticastSPR.java
+++ b/app/src/main/java/lightcontainer/interfaces/MulticastSPR.java
@@ -24,4 +24,6 @@ public interface MulticastSPR {
     String findDomain(Task task);
 
     void assignTask(String stor, Task task);
+
+    boolean hasDomain(String domain);
 }
diff --git a/app/src/main/java/lightcontainer/protocol/ProtocolReader.java b/app/src/main/java/lightcontainer/protocol/ProtocolReader.java
index 0990f1a..e1ad527 100644
--- a/app/src/main/java/lightcontainer/protocol/ProtocolReader.java
+++ b/app/src/main/java/lightcontainer/protocol/ProtocolReader.java
@@ -26,6 +26,7 @@ public abstract class ProtocolReader {
         STOREBACKEND
     }
 
+
     /**
      * Modèle utilisé par tout les résultats des règles de protocol.
      * Lorsqu'il retourne son résultat, on vérifie si il y a une demande de lecture/écriture de fichier depuis le réseau. Si oui on appel ces méthodes, sinon on ne fait rien.
@@ -42,6 +43,11 @@ public abstract class ProtocolReader {
          */
         private final Context context;
 
+        /**
+         * Domaine demandé pour l'exécution de cette commande (NULL si aucun domaine spécifique demandé)
+         */
+        private String requestDomain;
+
         public ProtocolResult(Context context) {
             this.context = context;
         }
@@ -58,7 +64,7 @@ public abstract class ProtocolReader {
          *
          * @return Receiver
          */
-        public ResultCmdReceiver getReceiver() {
+        public final ResultCmdReceiver getReceiver() {
             return receiver;
         }
 
@@ -67,7 +73,7 @@ public abstract class ProtocolReader {
          *
          * @return Commande
          */
-        public ProtocolWriter.ProtocolResult getResultCommand() {
+        public final ProtocolWriter.ProtocolResult getResultCommand() {
             return this.resultCommand;
         }
 
@@ -77,11 +83,12 @@ public abstract class ProtocolReader {
          * @param resultCommand Commande à envoyer
          * @param receiver      Le receveur de cette commande
          */
-        public void setResultCommand(ProtocolWriter.ProtocolResult resultCommand, ResultCmdReceiver receiver) {
+        public final void setResultCommand(ProtocolWriter.ProtocolResult resultCommand, ResultCmdReceiver receiver) {
             this.resultCommand = resultCommand;
             this.receiver = receiver;
         }
 
+
         /**
          * Permet de lire un fichier. Cad reçevoir le contenu d'un fichier provenant du réseau.
          * Redéfinissez cette méthode pour l'utiliser
@@ -96,10 +103,32 @@ public abstract class ProtocolReader {
          *
          * @return Context courant
          */
-        protected Context getContext() {
+        protected final Context getContext() {
             return context;
         }
 
+
+        /**
+         * Cette méthode est appelée lorsque la commande à exécuter ne peut pas être exécutée
+         */
+        public final  String onNotExecutable(Context context) {
+            ProtocolResult cmdResult = onError(context);
+            return cmdResult == null ? null : cmdResult.getResultCommand().getCommand();
+        }
+
+        /**
+         * Accesseur du domaine demandé pour l'exécution de cette commande (NULL si aucun domaine spécifique demandé)
+         */
+        public String getRequestDomain() {
+            return requestDomain;
+        }
+
+        /**
+         * Mutateur du domaine demandé pour l'exécution de cette commande (NULL si aucun domaine spécifique demandé)
+         */
+        public void setRequestDomain(String requestDomain) {
+            this.requestDomain = requestDomain;
+        }
     }
 
     /**
diff --git a/app/src/main/java/lightcontainer/protocol/ProtocolWriter.java b/app/src/main/java/lightcontainer/protocol/ProtocolWriter.java
index 481cdd8..8a772a0 100644
--- a/app/src/main/java/lightcontainer/protocol/ProtocolWriter.java
+++ b/app/src/main/java/lightcontainer/protocol/ProtocolWriter.java
@@ -60,6 +60,7 @@ public abstract class ProtocolWriter {
         public Context getContext() {
             return context;
         }
+
     }
 
     /**
diff --git a/app/src/main/java/lightcontainer/protocol/rules/reader/GetFileRule.java b/app/src/main/java/lightcontainer/protocol/rules/reader/GetFileRule.java
index 35323ca..4b4f056 100644
--- a/app/src/main/java/lightcontainer/protocol/rules/reader/GetFileRule.java
+++ b/app/src/main/java/lightcontainer/protocol/rules/reader/GetFileRule.java
@@ -4,9 +4,12 @@ import lightcontainer.domains.client.Context;
 import lightcontainer.interfaces.ProtocolRepository;
 import lightcontainer.protocol.ProtocolReader;
 import lightcontainer.protocol.rules.writer.GetFileErrorRule;
+import lightcontainer.protocol.rules.writer.GetFileOkRule;
 import lightcontainer.storage.File;
 import lightcontainer.storage.ReadOnlyFile;
 
+import java.util.Iterator;
+
 public class GetFileRule extends ProtocolReader {
     // Constants
     private static final String PATTERN = "^GETFILE ([^ !]{1,20})\r\n$";
@@ -50,6 +53,10 @@ public class GetFileRule extends ProtocolReader {
 
         ReadOnlyFile file = context.getFileOf(data[FILE_NAME], context.getLogin());
 
+        // Précision du store back end demandé pour traiter cette commande.
+        String requestDomain = extractRequestDomain(file.getStorageIterator());
+        result.setRequestDomain(requestDomain);
+
         if (true) {
 
         } else {
@@ -68,4 +75,14 @@ public class GetFileRule extends ProtocolReader {
         result.setResultCommand(protocolRep.executeWriter(context, GetFileErrorRule.NAME), ResultCmdReceiver.CLIENT);
         return result;
     }
+
+    /**
+     * TODO : But futur est de pouvoir en avoir plusieurs
+     * Cette méthode permet de choisir le domaine voulu.
+     * @param storageIterator Les domaines
+     * @return Le domain choisi
+     */
+    private String extractRequestDomain(Iterator<String> storageIterator) {
+        return storageIterator.next();
+    }
 }
diff --git a/app/src/main/java/lightcontainer/protocol/rules/reader/SavefileRule.java b/app/src/main/java/lightcontainer/protocol/rules/reader/SavefileRule.java
index 907b1ff..8ffde95 100644
--- a/app/src/main/java/lightcontainer/protocol/rules/reader/SavefileRule.java
+++ b/app/src/main/java/lightcontainer/protocol/rules/reader/SavefileRule.java
@@ -102,6 +102,8 @@ public class SavefileRule extends ProtocolReader {
     @Override
     protected SavefileRule.Result onExecuted(Context context, String... data) {
         SavefileRule.Result result = new SavefileRule.Result(context, data[FILE_NAME], Integer.parseInt(data[FILE_SIZE]));
+
+
         return result;
     }
 
diff --git a/app/src/main/java/lightcontainer/protocol/rules/writer/SendfileRule.java b/app/src/main/java/lightcontainer/protocol/rules/writer/SendfileRule.java
index e6971cc..b5826bc 100644
--- a/app/src/main/java/lightcontainer/protocol/rules/writer/SendfileRule.java
+++ b/app/src/main/java/lightcontainer/protocol/rules/writer/SendfileRule.java
@@ -11,7 +11,7 @@ import java.io.OutputStream;
  */
 public class SendfileRule extends ProtocolWriter {
 
-    private static final String PATTERN = "^SENDFILE [A-Za-z0-9.]{0,200} [0-9]{1,10} [A-Za-z0-9.]{50,200}\r\n$";
+    private static final String PATTERN = "^SENDFILE [A-Za-z0-9.]{50,200} [0-9]{1,10} [A-Za-z0-9.]{50,200}\r\n$";
 
     public static final String NAME = "SENDFILE";
 
diff --git a/app/src/main/java/lightcontainer/repository/FileFrontEnd.java b/app/src/main/java/lightcontainer/repository/FileFrontEnd.java
index 41c864e..e61dcde 100644
--- a/app/src/main/java/lightcontainer/repository/FileFrontEnd.java
+++ b/app/src/main/java/lightcontainer/repository/FileFrontEnd.java
@@ -82,4 +82,9 @@ public class FileFrontEnd implements ClientHandlerFFE, StoreProcessorFFE {
         tasks.add(task);
         alertStoreProcessors(task);
     }
+
+    @Override
+    public boolean canExecuteCommand(String domain) {
+        return storeRepository.hasDomain(domain);
+    }
 }
diff --git a/app/src/main/java/lightcontainer/repository/StoreProcessorRepository.java b/app/src/main/java/lightcontainer/repository/StoreProcessorRepository.java
index 30234e4..769208a 100644
--- a/app/src/main/java/lightcontainer/repository/StoreProcessorRepository.java
+++ b/app/src/main/java/lightcontainer/repository/StoreProcessorRepository.java
@@ -78,6 +78,17 @@ public class StoreProcessorRepository implements AutoCloseable, MulticastSPR {
         handler.executeCommand(task.getContext(), task.getCommand());
     }
 
+    @Override
+    public boolean hasDomain(String domain) {
+        for (StoreProcessor handler : handlers) {
+            if (handler.getDomain().equals(domain)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
     /**
      * AutoClosable Function
      * Closes all StoreProcessor stored in this repository and deallocates all resources.
diff --git a/app/src/main/resources/appdata.json b/app/src/main/resources/appdata.json
index bf62c9c..f9171fe 100644
--- a/app/src/main/resources/appdata.json
+++ b/app/src/main/resources/appdata.json
@@ -1,27 +1 @@
-{
-  "unicast_port": 8000,
-  "multicast_ip": "224.66.66.1",
-  "multicast_port": 15502,
-  "network_interface": "My network interface",
-  "tls": true,
-  "storagePath": "/home/benjamin/ffe",
-  "users": [
-    {
-      "name": "aaaaa",
-      "password": "5d628c274ebb008324f1e199d3bfff0a3fe839730a7f2355e82850d7acca5e5ca64db9071abf3d91034295695f84a617",
-      "aes_key": "qlTH6TijnfMRnrS0Qf+k6IPKGp5LoRMXGxCq16e+mF4=",
-      "passwordSalt": "Ns8Al6DpqPsIDlCSRBVTEg==",
-      "files": [
-        {
-          "name": "README.md",
-          "fileNameSalt": "/jo0zYyQs96gWI9OgBXiPQ==",
-          "size": 17,
-          "iv": "rvOFhgEvgFMISO44jqlSRg==",
-          "storage": [
-            "lightcontainerSB01"
-          ]
-        }
-      ]
-    }
-  ]
-}
\ No newline at end of file
+{"unicast_port":8000,"multicast_ip":"224.66.66.1","multicast_port":15502,"network_interface":"My network interface","tls":true,"storagePath":"/home/benjamin/ffe","users":[{"name":"aaaaa","password":"5d628c274ebb008324f1e199d3bfff0a3fe839730a7f2355e82850d7acca5e5ca64db9071abf3d91034295695f84a617","aes_key":"qlTH6TijnfMRnrS0Qf+k6IPKGp5LoRMXGxCq16e+mF4=","passwordSalt":"Ns8Al6DpqPsIDlCSRBVTEg==","files":[{"name":"main.py","fileNameSalt":"IJNYL681pFqbF9OHzRuHIg==","size":854,"iv":"bPCnwYbenKvFfwbhq+HI5A==","storage":["lightcontainerSB01"]},{"name":"README.md","fileNameSalt":"/jo0zYyQs96gWI9OgBXiPQ==","size":17,"iv":"rvOFhgEvgFMISO44jqlSRg==","storage":["lightcontainerSB01"]}]}]}
\ No newline at end of file