Erro ao conectar ao MSSQL 2000 em win 2003 server

segue abaixo o codigo

Connection con = null;
        try{
            Class.forName("net.sourceforge.jtds.jdbc.Driver");
        }
        catch (ClassNotFoundException ex){
            System.err.println( "Driver not found: " );
        }
        con = DriverManager.getConnection ("jdbc:jtds:sqlserver://192.168.1.6:1433;databaseName=DADOSADV");

e o erro

java.sql.SQLException: Cannot open database requested in login 'DADOSADV'. Login fails.
        at net.sourceforge.jtds.jdbc.SQLDiagnostic.addDiagnostic(SQLDiagnostic.java:365)
        at net.sourceforge.jtds.jdbc.TdsCore.tdsErrorToken(TdsCore.java:2781)
        at net.sourceforge.jtds.jdbc.TdsCore.nextToken(TdsCore.java:2224)
        at net.sourceforge.jtds.jdbc.TdsCore.login(TdsCore.java:606)
        at net.sourceforge.jtds.jdbc.ConnectionJDBC2.<init>(ConnectionJDBC2.java:331)
        at net.sourceforge.jtds.jdbc.ConnectionJDBC3.<init>(ConnectionJDBC3.java:50)
        at net.sourceforge.jtds.jdbc.Driver.connect(Driver.java:178)

o driver utilizado eh o jTDS http://jtds.sourceforge.net/

PS: o mesmo codigo rodou perfeitamente quando testei no servidor com win 2000 server e MSSQL 2000.

alguem sabe pq somente no WIN 2003 server deu problema?