Comment 25 for bug 1751842

Snip from glancelient (source for "Error finding address for")

        except requests.exceptions.ConnectionError as e:
            message = ("Error finding address for %(url)s: %(e)s" %
                       dict(url=conn_url, e=e))
            raise exc.(message=message)
        except socket.gaierror as e:
            message = "Error finding address for %s: %s" % (
                self.endpoint_hostname, e)
            raise exc.InvalidEndpoint(message=message)