unable to connect to any of the specified mysql hosts เออเรอร์ โดย connecstring ข้าม host ค่ะ

Imports System.Data
Imports MySql.Data.MySqlClient
Public Class GIS_RoutestationMin
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    End Sub

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
        Dim connectionString As String = "Server=......;Port=1234;Database=......;Uid=.....;Pwd=............;"
        Dim connection As New MySqlConnection(connectionString)
        If connection.State.Equals(ConnectionState.Closed) Then
            connection.Open()
        End If
        Dim QueryString As New StringBuilder()
        QueryString.Append("SELECT routestation.subrouteid,isgo,seqid)
        QueryString.Append(" FROM routestation ")
        QueryString.Append(" GROUP BY routestation.subrouteid, isgo")
        Response.Write(QueryString.ToString())

        Dim OracleAdapter As New MySqlDataAdapter(QueryString.ToString(), connection)
        Dim DataTable As New DataTable("TestTable")
        OracleAdapter.Fill(DataTable)
        GridView1.DataSource = DataTable
        GridView1.DataBind()
        GridView1.Visible = True
        Response.Write(DataTable.Rows.Count.ToString())
    End Sub
End Class