There are many possible causes for this problem. Your ODBC driver may not be properly installed or configured for your network. Your database server and/or network may be down. You might not have proper access rights or the proper password for your database.
We suggest you try to connect to your database with another tool that is supplied by your database vendor or a general tool such as Microsoft Excel. If you still encounter difficulties, you should first seek support from your local database administrator and/or the vendor who supplied your database or driver.