Entergy ArcGIS Server
Entergy's electric-network GIS platform at gis.entergy.com, running Esri ArcGIS Server 10.7.1. The service-info document answers anonymously and declares token-based security with a token service at https://gis.entergy.com/arcgis/tokens/; the SOAP catalog at https://gis.entergy.com/arcgis/services publishes a WSDL 1.1 contract with seven operations whose soap:address points back at gis.entergy.com. The service directory itself returns HTTP 200 carrying {"error":{"code":499,"message":"Token Required"}}, so the API is real and reachable while the map services behind it are not public.