Error Message: Connection failed: java.net.UnknownHostException: ODBC Usually seen in a large block of Java error text, such as this -- java.sql.SQLException: [OpenLink][OPLJDBC3]Connection failed: java.net.UnknownHostException: ODBC at openlink.jdbc3.OPLMessage.makeException(Unknown Source) at openlink.jdbc3.Driver.connect(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) This message typically means our Type 3 Driver has been loaded instead of our Type 1 Driver.You should generally have only one of the above drivers included in your CLASSPATH environment variable. Choose the one best matched to your active JVM, and supporting the connection Type, 1 or 3, you require.Our Type 1 JDBC Drivers have the following attributes --