System.ArgumentException: Keyword not supported "pwd" - ios

Question

I am developing a unity project which requires a MySQL connection.
My connection works fine in Unity and Android builds, but when I build the whole project into iOS platform, I had an error (I have localized this through a reporter plugin)
First an exception:
System.ArgumentException: Keyword not supported. Parameter name: pwd at MySql.Data.MSqlClient.MySqlConnectionStringBuilder.ValidateKeyword (System.String keyword) [0x000000] in <filename unknown>:0
Later an error:
NullReferenceException: A null value was found where an object instance was required.
HandlerMySQL.Conectar ()
The code is the following
using System.Collections.Generic;
using System.Security.Cryptography;
using MySql.Data;
using MySql.Data.MySqlClient;
public class HandlerMySQL{
public string host, database, user, password;
public bool pooling = true;
private string connectionString;
private static MySqlConnection con = null;
private MySqlCommand cmd = null;
private MySqlDataReader rdr = null;
private MD5 _md5Hash;
public HandlerMySQL(string h,string db, string u, string pw)
{
host = h;
database = db;
user = u;
password = pw;
}
public void Conectar()
{
connectionString = "Server=" + host + ";Database=" + database + ";Uid=" + user + ";Pwd=" + password + ";Pooling=";
if (pooling)
{
connectionString += "true;";
}
else
{
connectionString += "false;";
}
try
{
con = new MySqlConnection(connectionString);
con.Open();
Debug.Log("MySQL State: " + con.State);
}
catch(Exception e)
{
Debug.Log(e);
Debug.Log("MySQL State: " + con.State);
}
}
void OnApplicationQuit()
{
if (con != null)
{
if (con.State.ToString() != "Close")
{
con.Close();
Debug.Log("MySQL Connection closed");
}
con.Dispose();
}
}
public bool GetIsConnected()
{
if (con.State.ToString() == "Open")
{
return true;
}
else
{
return false;
}
}
public bool CreateData(string dnow, string dstart,int dend)
{
DataMySql data = new DataMySql(dnow, dstart, dend);
if (DataToolsMySql.Agregar(data, con) > 0)
{
Debug.Log("Se agrego correctamente");
return true;
}
else
{
Debug.Log("ERROR!!! No se agrego");
return false;
}
}
}