diff --git a/server/authentication.py b/server/authentication.py
index 22897dd..7505ae2 100644
--- a/server/authentication.py
+++ b/server/authentication.py
@@ -13,7 +13,7 @@ from Crypto.PublicKey import RSA
 from Crypto.PublicKey.RSA import RsaKey
 
 auth_logger = logging.getLogger('AUTH APPLICATION ')
-auth_logger.root.setLevel(logging.INFO)
+auth_logger.setLevel(logging.INFO)
 
 class Authetication:
     ABSOLUTE_PATH = os.path.abspath(os.path.dirname(sys.argv[0]))
@@ -120,7 +120,7 @@ class Authetication:
         with open(self.CONFIG_FILE_LOCATION) as json_file:
             data = json.load(json_file)
 
-        dictionary: dict
+        dictionary = dict()
 
         for user in data['user']:
             key = data['publicKey']
diff --git a/server/netwrapper.py b/server/netwrapper.py
index cae72f6..d94b982 100644
--- a/server/netwrapper.py
+++ b/server/netwrapper.py
@@ -36,8 +36,8 @@ class NetWrapper:
         cipher = PKCS1_OAEP.new(self.currentClientPublicKey)
         identMsg = json.dumps(
             {'type': 'IDY', 'source': self.network.own_addr,
-             'message': b64encode(cipher.encrypt(retmsg.encode('UTF-8')))}).decode(
-            'ASCII')
+             'message': b64encode(cipher.encrypt(retmsg.encode('UTF-8'))).decode('ASCII')}).encode(
+            'UTF-8')
         self.network.send_msg(self.clientAddr, identMsg)
 
     def sendMessage(self, message: bytes) -> None:
diff --git a/server/server.py b/server/server.py
index b4dba55..8b2ee3e 100644
--- a/server/server.py
+++ b/server/server.py
@@ -35,14 +35,14 @@ class Server:
         self.homeDirectory = ""
         self.executor.baseDir = Executor(self.homeDirectory)
 
-    def parseCommand(self, command: str) -> str:
+    def parseCommand(self, command: str) -> None:
         if command == "LINOK":
-            return "LINOK"
+            self.networkInstance.sendMessage("LINOK".encode('UTF-8'))
         elif command == "LINERROR":
-            return "LINERROR"
+            self.networkInstance.sendMessage("LINERROR".encode('UTF-8'))
         parsedCommand = command.split(" ")
         if len(parsedCommand) > 3:
-            return "ERROR"
+            self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
         # TODO: Ez igy gecironda, ezt meg kene csinalni rendesen.
         elif len(parsedCommand) == 1:
             return self.execute(parsedCommand[0])
@@ -51,42 +51,48 @@ class Server:
         elif len(parsedCommand) == 3:
             return self.execute(parsedCommand[0], parsedCommand[1], parsedCommand[2])
 
-    def execute(self, command: str, firstParam: str = "", secondParam: str = "") -> str:
+    def execute(self, command: str, firstParam: str = "", secondParam: str = "") -> None:
         if self.homeDirectory == "" or self.executor.currentDirectory == "" or self.executor.baseDir == "":
             raise Exception("Directories must not be empty string. Did the user log in?")
         if command == "MKD":
             if secondParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
-                return self.executor.createDirectory(firstParam)
+                self.executor.createDirectory(firstParam)
+                self.networkInstance.sendMessage("OK".encode('UTF-8'))
         elif command == "RMD":
             if secondParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
-                return self.executor.removeDirectory(firstParam)
+                self.executor.removeDirectory(firstParam)
+                self.networkInstance.sendMessage("OK".encode('UTF-8'))
         elif command == "GWD":
             if secondParam != "" or firstParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
-                return self.executor.getCurrentDirectory()
+                self.executor.getCurrentDirectory()
+                self.networkInstance.sendMessage("OK".encode('UTF-8'))
         elif command == "CWD":
             if secondParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
-                return self.executor.setCurrentDirectory(firstParam)
+                self.executor.setCurrentDirectory(firstParam)
+                self.networkInstance.sendMessage("OK".encode('UTF-8'))
         elif command == "LST":
             if secondParam != "" or firstParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
-                return self.executor.listCurrentDirectoryContent()
+                self.executor.listCurrentDirectoryContent()
+                self.networkInstance.sendMessage("OK".encode('UTF-8'))
         elif command == "RMF":
             if secondParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
-                return self.executor.removeFileInCurrentDirectory(firstParam)
+                self.executor.removeFileInCurrentDirectory(firstParam)
+                self.networkInstance.sendMessage("OK".encode('UTF-8'))
         elif command == "UPL":
             if secondParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
                 # TODO
                 # Megkapod a filenevet argumentumneknt
@@ -97,7 +103,7 @@ class Server:
                 pass
         elif command == "DNL":
             if secondParam != "":
-                return "ERROR"
+                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
             else:
                 # TODO
                 # Megkapod a filenevet arguemntumkent
@@ -107,7 +113,7 @@ class Server:
                 # Ha sikeres, OK valaszt megkapod, kulonben ERROR valaszt megkapod
                 pass
         else:
-            return "ERROR"
+            self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
 
     def startServer(self):
         while True: