openpop连gmail总进不去，求指点

[橘子皮...]

ReadPop3 a = new ReadPop3();
List<OpenPop.Mime.Message> L = new List<OpenPop.Mime.Message>();
 L = ReadPop3.FetchAllMessages(textBox1.Text,995, true, textBox2.Text, textBox3.Text);
 MessageBox.Show(L.Count.ToString());

public static List<OpenPop.Mime.Message> FetchAllMessages(string hostname, int port, bool useSsl, string username, string password)
    {
        // The client disconnects from the server when being disposed
        using (Pop3Client client = new Pop3Client())
        {
            if (useSsl)
            {
                client.Connect(hostname, port, true, 10000, 10000, certificateValidator);
            }
            else
            {
                client.Connect(hostname, port, useSsl);
            }

            client.Authenticate(username, password);
            int messageCount = client.GetMessageCount();
            List<OpenPop.Mime.Message> allMessages = new List<OpenPop.Mime.Message>(messageCount);
            for (int i = messageCount; i > 0; i--)
            {
                allMessages.Add(client.GetMessage(i));
            }
            return allMessages;
        }
    }

    private static bool certificateValidator(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslpolicyerrors)
    {
        return true;
    }

老提示server canot connect什么的，哪错了？？

[dylike]

关闭系统防火墙或将需要的端口在防火墙中开放。

[橘子皮...]

有人能帮忙试下么？