diff --git a/auth.py b/auth.py
index 41fdbad..b91fbdb 100644
--- a/auth.py
+++ b/auth.py
@@ -159,9 +159,20 @@ def authorize(data):
     nas_type = data_from_api["nas"]
     user = data_from_api["user"]
 
-    if not nas_type or nas_type and nas_type["port_access_mode"] == "802.1X":
-        password = user.get("pwd_ntlm", "")
-        logger.info(username.encode("utf-8"))
+    if not nas_type or (nas_type and nas_type["port_access_mode"]) == "802.1X":
+
+        # The user doesn't exist
+        if not user:
+            logger.info("User \"{0}\" does not exist, reject".format(username))
+            return radiusd.RLM_MODULE_REJECT
+
+        password = user.get("pwd_ntlm", None)
+
+        if not password:
+            logger.info("User \"{0}\" doesn't have a NTLM password, reject".format(username))
+            return radiusd.RLM_MODULE_REJECT
+
+        logger.info("User \"{0}\" accepted in authorize".format(username))
 
         return (
             radiusd.RLM_MODULE_UPDATED,
@@ -249,8 +260,8 @@ def post_auth(data):
         result, log = check_user_machine_and_register(
                 nas_type, user, user_interface, nas, username, mac)
 
-        logger.info(log.encode("utf-8"))
-        logger.info(username.encode("utf-8"))
+        logger.info(log)
+        logger.info(username)
 
         if not result:
             return radiusd.RLM_MODULE_REJECT