diff --git a/controller/AppController.py b/controller/AppController.py
index 7b3376a..c620961 100644
--- a/controller/AppController.py
+++ b/controller/AppController.py
@@ -3,6 +3,7 @@ from model.Protocol import *
 import traceback
 import os.path
 
+
 class AppController:
     def __init__(self, parser):
         self.parser = parser
@@ -19,8 +20,8 @@ class AppController:
         print("[AppController::on_sign]")
         try:
             if not self.connection.is_connected:
-               print("[AppController::on_sign] connecting ... calling UnicastConnection::connect")
-               self.connect(host, port, tls)
+                print("[AppController::on_sign] connecting ... calling UnicastConnection::connect")
+                self.connect(host, port, tls)
             if not register:
                 message = self.parser.build_SIGNIN(login, passw)
             else:
@@ -31,9 +32,10 @@ class AppController:
             if message_id == Protocol.PARSE_SIGNOK:
                 self.window_controller.switch_connected_mode()
                 self.show_message("Connection done", False)
+                self.on_filelist()
             elif message_id == Protocol.PARSE_SIGNERROR:
                 self.show_message("Error during SIGN_IN / SIGN_UP", True)
-            self.on_filelist()
+                self.connection.close()
         except Exception as ex:
             print(ex)
             traceback.print_exc()
@@ -41,7 +43,7 @@ class AppController:
     def get_filename_size_from_item(self, item):
         tokens = item.split('!')
         if len(tokens) == 2:
-            return (tokens[0],tokens[1])
+            return (tokens[0], tokens[1])
         else:
             return None
 
@@ -117,7 +119,7 @@ class AppController:
         elif message_id == Protocol.PARSE_REMOVEFILEERROR:
             self.show_message("Error while erasing file.", True)
 
-    def show_message(self,message, is_error):
+    def show_message(self, message, is_error):
         self.window_controller.show_message(message, is_error)
 
     def connect(self, host, port, tls):
diff --git a/gui/MainWindow.py b/gui/MainWindow.py
index 16dfef2..13b66de 100644
--- a/gui/MainWindow.py
+++ b/gui/MainWindow.py
@@ -11,10 +11,15 @@ class MainWindow:
         self.root.title("SecCon - © Louis SWINNEN 2022")
         self.root.config(bd=5)
         self.host = tk.StringVar()
+        self.host.set("ffe.labo.swilabus.com")
         self.passw = tk.StringVar()
+        self.passw.set("aaaaa")
         self.login = tk.StringVar()
+        self.login.set("aaaaa")
         self.tls = tk.BooleanVar()
+        self.tls.set(True)
         self.port = tk.IntVar()
+        self.port.set(8000)
         self.draw_window()
 
     def start_main_loop(self):
diff --git a/net/UnicastConnection.py b/net/UnicastConnection.py
index a11ea9a..e854269 100644
--- a/net/UnicastConnection.py
+++ b/net/UnicastConnection.py
@@ -107,5 +107,11 @@ class UnicastConnection:
 
     def close(self):
         self.sock.close()
+        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        self.is_connected = False
+        self.is_tls = False
+        self.ssock = None
+        self.ca_path = None
+        self.ssl_info = None