diff --git a/swh/lister/core/lister_transports.py b/swh/lister/core/lister_transports.py
--- a/swh/lister/core/lister_transports.py
+++ b/swh/lister/core/lister_transports.py
@@ -7,6 +7,7 @@
 from datetime import datetime
 from email.utils import parsedate
 from pprint import pformat
+import logging
 
 import requests
 import xmltodict
@@ -20,6 +21,9 @@
 from .lister_base import FetchError
 
 
+logger = logging.getLogger(__name__)
+
+
 class SWHListerHttpTransport(abc.ABC):
     """Use the Requests library for making Lister endpoint requests.
 
@@ -114,6 +118,7 @@
             else:
                 response = self.session.get(path, **params)
         except requests.exceptions.ConnectionError as e:
+            logger.warning('Failed to fetch %s: %s', path, e)
             raise FetchError(e)
         else:
             if response.status_code not in self.EXPECTED_STATUS_CODES: