When connecting to Oracle from Tableau Desktop or Tableau Prep, the error below occurs and is unable to connect to Oracle.
"IO Error: The Network Adapter could not establish the connection
Unable to connect to the Oracle server "<server>". Check that the server is running and that you have access privileges to the requested database."
When the issue occurs, the below error was found in jprotocolserver.log.
”Caused by: java.net.UnknownHostException: Unknown Host Name (XXXX)”