diff --git a/diagnostic.py b/diagnostic.py
index d56132c..8d0faeb 100755
--- a/diagnostic.py
+++ b/diagnostic.py
@@ -125,21 +125,22 @@ def check_configuration(spinner):
     cfg.read(configfile)
     configuration_file = cfg
     cfg = {s: dict(cfg.items(s)) for s in cfg.sections()}
-    configfile = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'config/config.cfg.default')
+    configfile_default = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'config/config.cfg.default')
     cfg_default = configparser.ConfigParser()
-    cfg_default.read(configfile)
+    cfg_default.read(configfile_default)
     cfg_default = {s: dict(cfg_default.items(s)) for s in cfg_default.sections()}
 
     # Check if all fields from config.default exists in config
     result, faulties = diagnostic_util.dict_compare(cfg_default, cfg)
-    faulties = [item for sublist in faulties for item in sublist]
     if result:
         port = configuration_file.get("Server", "port")
         return (True, '')
     else:
-        return (False, f'''Configuration incomplete.
-\tUpdate your configuration file `config.cfg`.\n\t➥ Faulty fields: {", ".join(faulties)}''')
-    # TODO: propose auto fix
+        return_text = '''Configuration incomplete.
+\tUpdate your configuration file `config.cfg`.\n\t➥ Faulty fields:\n'''
+        for field_name in faulties:
+            return_text += f'\t\t- {field_name}\n'
+        return (False, return_text)
 
 
 @add_spinner(name='dot')
diff --git a/diagnostic_util.py b/diagnostic_util.py
index a86b95e..2898e9a 100644
--- a/diagnostic_util.py
+++ b/diagnostic_util.py
@@ -1,19 +1,27 @@
-def dict_compare(dict1, dict2):
+import configparser
+
+
+def dict_compare(dict1, dict2, itercount=0):
     dict1_keys = set(dict1.keys())
     dict2_keys = set(dict2.keys())
     intersection = dict1_keys.difference(dict2_keys)
-    if len(intersection) > 0:
+    faulties = []
+    if itercount > 0 and len(intersection) > 0:
         return (False, list(intersection))
 
     flag_no_error = True
-    faulties = []
     for k, v in dict1.items():
-        if (isinstance(v, dict)):
-            status, faulty = dict_compare(v, dict2[k])
-            flag_no_error = flag_no_error and status
-            faulties.append(faulty)
+        if isinstance(v, dict):
+            if k not in dict2:
+                faulties.append({k: dict1[k]})
+                flag_no_error = False
+            else:
+                status, faulty = dict_compare(v, dict2[k], itercount+1)
+                flag_no_error = flag_no_error and status
+                if len(faulty) > 0:
+                    faulties.append({k: faulty})
         else:
-            (True, [])
+            return (True, [])
     if flag_no_error:
         return (True, [])
     else: