Install SQL Developer version 21.4.2.018 but I don't know the password of the sys user, when installing the app I never ask for the password and when trying to create a database it gives me the following error
Estado: Fallo:Fallo de la prueba: Error de E/S: The Network Adapter could not establish the connection (CONNECTION_ID=ahNcmviuTQOv+VHuPqSZWQ==)