通过SSH进行远程MySQL连接需要很长时间

Question

我通过SSH从远程Mysql数据库获取数据到我的本地SQL服务器，然后从远程服务器删除所有数据;在我的C＃ASP.net应用程序中（在IIS中运行）。从星期五开始它运行得非常好，但今天连接速度非常慢。我的连接代码是：

using (var client = new SshClient("vps.abc.com", 22, "username", "password"))
            {
                client.Connect();

                var port = new ForwardedPortLocal("127.0.0.1", 3307, "localhost", 3306);
                client.AddForwardedPort(port);

                port.Start();

                string connstr = "server=127.0.0.1;user=" + "user" + ";database=database;port=" + "3307" + ";password=" + "password" + ";";
                using (MySqlConnection conn = new MySqlConnection(connstr))
                {
                    conn.Open();
                    MySqlCommand cmd = new MySqlCommand("SELECT DISTINCT * from formstable ORDER BY id DESC ", conn);
                    MySqlDataReader dr = cmd.ExecuteReader();
                    if (dr.HasRows)
                    {
                        while (dr.Read())
                        {
                            DateTime updated;
                            if (Convert.IsDBNull(dr["updated_at"]))
                            {
                                updated = Convert.ToDateTime(dr["created_at"]);
                            }
                            else
                            {
                                updated = Convert.ToDateTime(dr["updated_at"]);
                            }
                            var formsquote = new FormsQuote
                            {
                                //id = Convert.ToInt16(dr["id"]),
                                name = dr["name"].ToString(),
                                phone = dr["phone"].ToString()                                
                            };
                            FormsQuoteAdapter.Insert(formsquote);
                        }
                    }
                    dr.Close();
                    MySqlCommand cmd1 = new MySqlCommand("Delete FROM formstable ", conn);
                    cmd1.ExecuteNonQuery();
                    conn.Close();
                }

                port.Stop();
                client.Disconnect();

我使用断点检查了行client.Connect();花了很多时间。我不知道突然出了什么问题。任何人都可以帮我解决这个问题。谢谢