Warn on socket.gaierror in main.bootstrap_from_dns()

minode/main.py

@@ -116,7 +116,8 @@ def bootstrap_from_dns():
                 else:
                     shared.core_nodes.add((addr, port))
     except socket.gaierror:
-        pass
+        logging.warning(
+            'Failed to resolve the seed for port %s', port, exc_info=True)
     except Exception:
         logging.info('Error during DNS bootstrap', exc_info=True)