c# .Net4 webRequest over SSL not working

Question

Hi this works when posting to an http address but fails when posting to an HTTPS address with can't estabilish a trust relationship!

What do I need to do to this or is this a server error!?

private static string HttpPost (string uri, string parameters)
{
    //return "ok";
    // parameters: name1=value1&name2=value2    
    try
    {
        WebRequest webRequest = WebRequest.Create(uri);

        webRequest.ContentType = "application/x-www-form-urlencoded";
        webRequest.Method = "POST";
        byte[] bytes = Encoding.ASCII.GetBytes(parameters);
        Stream os = null;
        try
        { // send the Post
            webRequest.ContentLength = bytes.Length;   //Count bytes to send
            os = webRequest.GetRequestStream();
            os.Write(bytes, 0, bytes.Length);         //Send it
        }
        catch (WebException ex)
        {
            MessageBox.Show(ex.Message, "HttpPost: Request error",
               MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
        finally
        {
            if (os != null)
            {
                os.Close();
            }
        }

        try
        { // get the response
            WebResponse webResponse = webRequest.GetResponse();
            if (webResponse == null)
            { return null; }
            StreamReader sr = new StreamReader(webResponse.GetResponseStream());
            return sr.ReadToEnd().Trim();
        }
        catch (WebException ex)
        {
            MessageBox.Show(ex.Message, "HttpPost: Response error",
               MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }
    catch
    {

    }
   return null;
} // end HttpPost

You say it fails... what exception are you getting? If you visit the https .site in a browser does it work properly? — Nik
– Nik, Commented Sep 14, 2010 at 20:04
BTW: Any reason you're using HttpWebRequest instead of WebClient .UploadValues? — dtb
– dtb, Commented Sep 14, 2010 at 20:05
System.Net.WebException was caught Message=The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. Source=System — Adrian
– Adrian, Commented Sep 14, 2010 at 20:16
I'm using HttpWebRequest as I googled and could not find another way of doing an HTTP Post to a server... — Adrian
– Adrian, Commented Sep 14, 2010 at 20:17
@Adrian: WebClient is usually the best option to do HTTP requests, unless you need a specific feature that only HttpWebRequest provides. WebClient.UploadValues does an HTTP POST request. — dtb
– dtb, Commented Sep 14, 2010 at 20:22

dtb · Accepted Answer · 2010-09-14 20:21:04Z

1

The SSL certificate is expired or invalid. Deploy a new, valid SSL certificate on the server.

answered Sep 14, 2010 at 20:21

dtb

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Wyatt Barnett · Accepted Answer · 2010-09-14 20:24:45Z

1

Or explicitly trust the cert if that is the right thing to do.

answered Sep 14, 2010 at 20:24

Wyatt Barnett

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2 Comments

Adrian Over a year ago

I found this code that works but not sure of the implications or if it will reside after exiting!?

Adrian Over a year ago

ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(delegate(object sender2,X509Certificate certificate, X509Chain chain,SslPolicyErrors sslPolicyErrors) { return true; });

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