unable to connect to any of the specified mysql

Hi,

I am trying to connect from C# WinForm application to MySQL but getting the above error.

MySQL is on CentOS and I am connected through NaviCat without any problem with enabling SSH Tuning option in NaviCat.

here is my code in C#:

sql_connection = new MySqlConnection(xmlClass.get_connectionstring("BizCards\\BizCards"));
sql_connection.Open();

sql_command = new MySqlCommand("sp_populate_countries", sql_connection);
sql_command.CommandType = CommandType.StoredProcedure;

// Create data adapter object 
sql_adapter = new MySqlDataAdapter();
sql_adapter.SelectCommand = sql_command;

// Create a dataset object and fill with data using data adapter's Fill method 
data_set = new DataSet();
sql_adapter.Fill(data_set, "countries");
DataViewManager dataview_manager = new DataViewManager(data_set);
DataView main_dataview = dataview_manager.CreateDataView(data_set.Tables["countries"]);

cboCountry.Properties.ValueMember = "country_code_alpha2";
cboCountry.Properties.DisplayMember = "country_name";
cboCountry.Properties.DataSource = main_dataview;

cboCountry.Properties.Columns.Add(new DevExpress.XtraEditors.Controls.LookUpColumnInfo("country_name", 50, "country_name"));

cboCountry.Properties.ShowHeader = false;

cboCountry.Properties.PopupSizeable = false;
cboCountry.Properties.ShowFooter = false;
cboCountry.Properties.PopupWidth = 50;