using Mysql: Ca't create TCP/IP socket

[blackliteon]

Trying to create connection, but always see this message
Ca't create TCP/IP socket (10093): QMYSQL unable to connect
Os: WinXP, Qt 4.1, compiler VC.net
set all availible parameters in sql example file:

QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName("localhost");
    db.setDatabaseName("qt");
    db.setUserName("root");
    db.setPassword("xxw22332");
    db.setPort(3306);
	if (!db.open()) {
        QMessageBox::critical(0, qApp->tr("Cannot open database"),
            db.lastError().text(), QMessageBox::Cancel,
                     QMessageBox::NoButton);
        return false;
    }

QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName("localhost");
    db.setDatabaseName("qt");
    db.setUserName("root");
    db.setPassword("xxw22332");
    db.setPort(3306);
	if (!db.open()) {
        QMessageBox::critical(0, qApp->tr("Cannot open database"),
            db.lastError().text(), QMessageBox::Cancel,
                     QMessageBox::NoButton);
        return false;
    }

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connection parameters right.
Try to build mysql plugin from source...
But error everytime.