unable to connect to any of the specified MySQL host cpanel

Question

i get the error

Unable to connect to any of the specified MySQL hosts

string conn_string = "Server=jelletaal.nl;Port=3306;Database=jelletaa_thepuckcup;Uid=jelletaa_jelle;Pwd = nP_9+hC_!_2E;";
        MySqlConnectionStringBuilder connstring = new MySqlConnectionStringBuilder();
        try
        {
            MySqlConnection conn = new MySqlConnection(conn_string);
            conn.Open();
            MessageBox.Show("succesfully created connection to database");
        }
        catch (MySql.Data.MySqlClient.MySqlException ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

in my cpannel I have created a database called jelletaa_thepuckcup

I have created a user called jelletaa_jelle

with the password nP_9+hC_!_2E

the domain is jelletaal.nl

i have also granted my ip adress acces to the database

if anyone knows what i have to do tho get this working, please tell me.