diff --git a/src/cloudforet/cost_analysis/connector/azure_cost_mgmt_connector.py b/src/cloudforet/cost_analysis/connector/azure_cost_mgmt_connector.py
index 5b43c53..0537578 100644
--- a/src/cloudforet/cost_analysis/connector/azure_cost_mgmt_connector.py
+++ b/src/cloudforet/cost_analysis/connector/azure_cost_mgmt_connector.py
@@ -187,6 +187,8 @@ def convert_nested_dictionary(self, cloud_svc_object):
     def _download_cost_data(blob: dict) -> str:
         try:
             response = requests.get(blob.get('blob_link'))
+            if response.status_code != 200:
+                raise ERROR_CONNECTOR_CALL_API(reason=f'{response.reason}')
             return response.text
         except Exception as e:
             _LOGGER.error(f'[_download_cost_data] download error: {e}', exc_info=True)
diff --git a/src/cloudforet/cost_analysis/error/cost.py b/src/cloudforet/cost_analysis/error/cost.py
index d805663..eb7a145 100644
--- a/src/cloudforet/cost_analysis/error/cost.py
+++ b/src/cloudforet/cost_analysis/error/cost.py
@@ -19,3 +19,6 @@ class ERROR_EMPTY_CUSTOMER_TENANTS(ERROR_INVALID_ARGUMENT):
 
 class ERROR_INVALID_TOKEN(ERROR_INVALID_ARGUMENT):
     _message = 'Invalid token: {token}'
+
+class ERROR_CONNECTOR_CALL_API(ERROR_UNKNOWN):
+    _message = 'API Call Error: {reason}'