diff --git a/configcatclient/config.py b/configcatclient/config.py
index 68eb08e..f550e96 100644
--- a/configcatclient/config.py
+++ b/configcatclient/config.py
@@ -1,3 +1,5 @@
+import sys
+
 from enum import IntEnum
 
 CONFIG_FILE_NAME = 'config_v6'
@@ -61,6 +63,24 @@
 UNSUPPORTED_VALUE = 'unsupported_value'
 
 
+def is_type_missmatch(value, py_type):
+    is_float_int_missmatch = \
+        (type(value) is float and py_type is int) or \
+        (type(value) is int and py_type is float)
+
+    # On Python 2.7, ignore the type missmatch is between str and unicode.
+    # (ignore warning: unicode is undefined in Python 3)
+    is_str_unicode_missmatch = \
+        (sys.version_info[0] == 2 and type(value) is unicode and py_type is str) or \
+        (sys.version_info[0] == 2 and type(value) is str and py_type is unicode)  # noqa: F821
+
+    if type(value) is not py_type:
+        if not is_float_int_missmatch and not is_str_unicode_missmatch:
+            return True
+
+    return False
+
+
 def get_value(dictionary, setting_type):
     value_descriptor = dictionary.get(VALUE)
     if value_descriptor is None:
@@ -74,8 +94,8 @@ def get_value(dictionary, setting_type):
         raise ValueError('Unsupported setting type')
 
     value = value_descriptor.get(expected_value_type)
-    if value is None:
-        raise ValueError('Setting value is not of the expected type %s' % expected_py_type)
+    if value is None or is_type_missmatch(value, expected_py_type):
+        raise ValueError("Setting value is not of the expected type %s" % expected_py_type)
 
     return value
 
diff --git a/configcatclient/configcatclient.py b/configcatclient/configcatclient.py
index aaccb1e..e44297e 100644
--- a/configcatclient/configcatclient.py
+++ b/configcatclient/configcatclient.py
@@ -1,10 +1,10 @@
 import logging
-import sys
 from threading import Lock
 
 from . import utils
 from .configservice import ConfigService
-from .config import TARGETING_RULES, VARIATION_ID, PERCENTAGE_OPTIONS, FEATURE_FLAGS, SERVED_VALUE, SETTING_TYPE
+from .config import TARGETING_RULES, VARIATION_ID, PERCENTAGE_OPTIONS, FEATURE_FLAGS, SERVED_VALUE, SETTING_TYPE, \
+    is_type_missmatch
 from .evaluationdetails import EvaluationDetails
 from .evaluationlogbuilder import EvaluationLogBuilder
 from .interfaces import ConfigCatClientException
@@ -375,22 +375,11 @@ def _get_config(self):
         return self._config_service.get_config()
 
     def _check_type_missmatch(self, value, default_value):
-        is_float_int_missmatch = \
-            (type(value) is float and type(default_value) is int) or \
-            (type(value) is int and type(default_value) is float)
-
-        # On Python 2.7, do not log a warning if the type missmatch is between str and unicode.
-        # (ignore warning: unicode is undefined in Python 3)
-        is_str_unicode_missmatch = \
-            (sys.version_info[0] == 2 and type(value) is unicode and type(default_value) is str) or \
-            (sys.version_info[0] == 2 and type(value) is str and type(default_value) is unicode)  # noqa: F821
-
-        if default_value is not None and type(value) is not type(default_value):
-            if not is_float_int_missmatch and not is_str_unicode_missmatch:
-                self.log.warning("The type of a setting does not match the type of the specified default value (%s). "
-                                 "Setting's type was %s but the default value's type was %s. "
-                                 "Please make sure that using a default value not matching the setting's type was intended." %
-                                 (default_value, type(value), type(default_value)), event_id=4002)
+        if default_value is not None and is_type_missmatch(value, type(default_value)):
+            self.log.warning("The type of a setting does not match the type of the specified default value (%s). "
+                             "Setting's type was %s but the default value's type was %s. "
+                             "Please make sure that using a default value not matching the setting's type was intended." %
+                             (default_value, type(value), type(default_value)), event_id=4002)
 
     def _evaluate(self, key, user, default_value, default_variation_id, config, fetch_time):
         user = user if user is not None else self._default_user
diff --git a/configcatclient/configfetcher.py b/configcatclient/configfetcher.py
index fe9b9a1..e0963e1 100644
--- a/configcatclient/configfetcher.py
+++ b/configcatclient/configfetcher.py
@@ -201,6 +201,8 @@ def _fetch(self, etag):  # noqa: C901
             self.log.error(error, *error_args, event_id=1102)
             return FetchResponse.failure(Logger.format(error, error_args), True)
         except Exception as e:
-            error = 'Unexpected error occurred while trying to fetch config JSON.'
+            error = 'Unexpected error occurred while trying to fetch config JSON. It is most likely due to a local network ' \
+                    'issue. Please make sure your application can reach the ConfigCat CDN servers (or your proxy server) ' \
+                    'over HTTP.'
             self.log.exception(error, event_id=1103)
             return FetchResponse.failure(Logger.format(error, (), e), True)
diff --git a/configcatclient/rolloutevaluator.py b/configcatclient/rolloutevaluator.py
index ec51ed0..ccf79f4 100644
--- a/configcatclient/rolloutevaluator.py
+++ b/configcatclient/rolloutevaluator.py
@@ -395,13 +395,12 @@ def _evaluate_prerequisite_flag_condition(self, prerequisite_flag_condition, con
         prerequisite_flag_setting_type = settings[prerequisite_key].get(SETTING_TYPE)
         prerequisite_comparison_value_type = get_value_type(prerequisite_flag_condition)
 
+        prerequisite_comparison_value = get_value(prerequisite_flag_condition, prerequisite_flag_setting_type)
+
         # Type mismatch check
         if prerequisite_comparison_value_type != SettingType.to_type(prerequisite_flag_setting_type):
-            raise ValueError("Type mismatch between comparison value type %s and type %s of prerequisite flag '%s'" %
-                             (prerequisite_comparison_value_type, SettingType.to_type(prerequisite_flag_setting_type),
-                              prerequisite_key))
-
-        prerequisite_comparison_value = get_value(prerequisite_flag_condition, prerequisite_flag_setting_type)
+            raise ValueError("Type mismatch between comparison value '%s' and prerequisite flag '%s'" %
+                             (prerequisite_comparison_value, prerequisite_key))
 
         prerequisite_condition = ("Flag '%s' %s '%s'" %
                                   (prerequisite_key, PREREQUISITE_COMPARATOR_TEXTS[prerequisite_comparator],
diff --git a/configcatclienttests/test_config.py b/configcatclienttests/test_config.py
new file mode 100644
index 0000000..15c2b1e
--- /dev/null
+++ b/configcatclienttests/test_config.py
@@ -0,0 +1,50 @@
+import logging
+import unittest
+
+import pytest
+
+from configcatclient.config import get_value, SETTING_TYPE
+
+logging.basicConfig(level=logging.INFO)
+
+
+class ConfigTests(unittest.TestCase):
+    def test_value_setting_type_is_missing(self):
+        value_dictionary = {
+            't': 6,  # unsupported setting type
+            'v': {
+                'b': True
+            }
+        }
+        setting_type = value_dictionary.get(SETTING_TYPE)
+        with pytest.raises(ValueError) as e:
+            get_value(value_dictionary, setting_type)
+        assert str(e.value) == "Unsupported setting type"
+
+    def test_value_setting_type_is_valid_but_return_value_is_missing(self):
+        value_dictionary = {
+            't': 0,  # boolean
+            'v': {
+                's': True  # the wrong property is set ("b" should be set)
+            }
+        }
+        setting_type = value_dictionary.get(SETTING_TYPE)
+        with pytest.raises(ValueError) as e:
+            get_value(value_dictionary, setting_type)
+        assert str(e.value) == "Setting value is not of the expected type <type 'bool'>"
+
+    def test_value_setting_type_is_valid_and_the_return_value_is_present_but_it_is_invalid(self):
+        value_dictionary = {
+            't': 0,  # boolean
+            'v': {
+                'b': 'True'  # the value is a string instead of a boolean
+            }
+        }
+        setting_type = value_dictionary.get(SETTING_TYPE)
+        with pytest.raises(ValueError) as e:
+            get_value(value_dictionary, setting_type)
+        assert str(e.value) == "Setting value is not of the expected type <type 'bool'>"
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/configcatclienttests/test_rollout.py b/configcatclienttests/test_rollout.py
index 9c3cb3e..34acaa3 100644
--- a/configcatclienttests/test_rollout.py
+++ b/configcatclienttests/test_rollout.py
@@ -556,8 +556,10 @@ def test_prerequisite_flag_comparison_value_type_mismatch(self, key, comparison_
             error_log = log_handler.error_logs[0]
             prerequisite_flag_value_type = SettingType.to_type(SettingType.from_type(type(prerequisite_flag_value)))
 
-            self.assertTrue(("Type mismatch between comparison value type %s and type %s of prerequisite flag '%s'" %
-                             (comparison_value_type, prerequisite_flag_value_type, prerequisite_flag_key)) in error_log)
+            if prerequisite_flag_value is None or prerequisite_flag_value_type is None:
+                self.assertTrue('Unsupported setting type' in error_log)
+            else:
+                self.assertTrue(("Setting value is not of the expected type %s" % prerequisite_flag_value_type) in error_log)
 
         client.close()