Unable to open database.
Error message:

exception 'PDOException' with message 'SQLSTATE[08001] SQLDriverConnect: 0 [unixODBC][FreeTDS][SQL Server]Unable to connect to data source' in /var/www/sites/tjs-opintokeskusfi/web/sites/default/modules/extdb/inc/Extdb.class.inc:22 Stack trace: #0 /var/www/sites/tjs-opintokeskusfi/web/sites/default/modules/extdb/inc/Extdb.class.inc(22): PDO->__construct('odbc:Driver=Fre...') #1 /var/www/sites/tjs-opintokeskusfi/web/sites/default/modules/markku/markku.module(263): Extdb->__construct() #2 /var/www/sites/tjs-opintokeskusfi/web/sites/default/modules/markku/markku.module(633): markku_kenelle_load('2199') #3 /var/www/sites/tjs-opintokeskusfi/web/sites/default/modules/markku/markku.pages.inc(101): _markku_get_courses(Array, Array) #4 [internal function]: markku_po_courses('', '', '', '', '', '', '', '') #5 /var/www/sites/tjs-opintokeskusfi/web/includes/menu.inc(517): call_user_func_array('markku_po_cours...', Array) #6 /var/www/sites/tjs-opintokeskusfi/web/index.php(21): menu_execute_active_handler() #7 {main}.