อยากรู้วิธีแก้ vb2010 error : unable to connect to any of the specified mysql host

Imports System.Data
Imports MySql.Data.MySqlClient
Imports System.Data.SqlClient
Public Class Form1
    Dim serverstring As String = "server=....;user id=.....;password=.....;database=.....;"
    Dim sqlconnection As MySqlConnection = New MySqlConnection
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        sqlconnection.ConnectionString = serverstring
        Try
            If sqlconnection.State = ConnectionState.Closed Then
                sqlconnection.Open()
                MsgBox("เชื่อมต่อสำเร็จ")
            Else
                sqlconnection.Close()
            End If
        Catch ex As Exception
            MessageBox.Show("Error : " & ex.Message & "")
            End
        End Try
    End Sub