Erro SQL

Error Trace in getConnection() : [Microsoft][SQLServer 2000 Driver for JDBC][SQLServer]Login failed for user 'frigorifico'. Reason: Not associated with a trusted SQL Server connection. 
Error: No active Connection

public class ConectarSQL {
    
    private java.sql.Connection con = null;
    private java.sql.Statement stm = null;
    private java.sql.ResultSet rs = null;
    
    /** Creates a new instance of ConectarSqlServer */
    public ConectarSQL() {
        this.executaConsulta();
    }
    /**
     *
     */
    private void executaConsulta() {
        try {
            con = this.conectarBanco("127.0.0.1", "1433", "sa", "");
            if(con != null) {
                String consulta = "SELECT * FROM tbl_login";
                stm = con.createStatement();
                rs = stm.executeQuery(consulta);
                while(rs.next()) {
                    System.out.println(rs.getString(1) + " - " + rs.getString(2));
                }
            }
        }catch(java.sql.SQLException erro) {
            erro.printStackTrace();
        }catch(Exception erro) {
            erro.printStackTrace();
        } finally {
            try { if(con != null) con.close(); } catch(Exception erro) { erro.printStackTrace();}
            try { if(stm != null) stm.close(); } catch(Exception erro) { erro.printStackTrace();}
            try { if(rs != null) rs.close(); } catch(Exception erro) { erro.printStackTrace();}
        }
    }
    
    /**
     *
     */
    private java.sql.Connection conectarBanco(String ip, String porta, String user, String pass) {
        try {
            String driver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
            String cnnString = "jdbc:microsoft:sqlserver://" + ip + ":" + porta + ":" + user + ":" + pass;
            Class.forName(driver);
            return java.sql.DriverManager.getConnection(cnnString);
        } catch(java.sql.SQLException erro) {
            erro.printStackTrace();
        } catch(Exception erro) {
            erro.printStackTrace();
        }
        return null;
    }
    public static void main(String[] args){
        ConectarSQL sql = new ConectarSQL();
        System.exit(0);
    }}