ora-12203: TNS:unable to connect to destination

Cause: Invalid address specified or destination is not listening. This error can also occur because of underlying network or network transport problems.
Action: Verify that the net service name you entered was correct. Verify that the ADDRESS portion of the connect descriptor which corresponds to the net service name is correct. Ensure that the destination process (for example the listener) is running at the remote node.

TNS:no se ha podido conectar con el destino
TNS : connexion à la destination impossible
TNS: Ziel nicht erreichbar
TNS:incapaz de ligar ao destino
ora-01241 ora-07844 ora-19200