Getting "Handshake failed...unexpected packet format" when using WebClient.UploadFile() with "https" when the server has a valid SSL certificate

Question

I am trying to use WebClient.UploadFile with a HTTPS URL but I am ending up with

"System.IO.IOException: The handshake failed due to an unexpected packet format"

The same code works perfectly fine with Http but the server that I am trying to hit has a perfectly fine ssl certificate. Here is anything relevant to the web call:

var url = WebServiceCommunication.GetProtocolName() + "..."; //turns out to be     "https://... var wc = new WebClient(); //I am adding:  wc.Headers.Add(HttpRequestHeader.KeepAlive, "...") wc.Headers.Add(HttpRequestHeader.AcceptLanguage, "...") we.Headers.Add(HttpRequestHeader.Cookie, "...")  wc.UploadFile(url, "POST", filename); 

Is the issue with any of the HttpRequestHeaders I am adding AND using https with those? Or am I missing a necessary header if I want to use https? Does anyone have any pointers as to why this would work with HTTP but NOT HTTPS when the SSL cert is valid?

Answer 1

You have to make sure the port you are connecting to is port 443 instead of port 80.

Example of explicitly setting the port to be used in the URL:

var request = (HttpWebRequest) WebRequest.Create("https://example.com:443/"); request.Method = "GET"; request.UserAgent = "example/1.0"; request.Accept = "*/*"; request.Host = "example.com";  var resp = (HttpWebResponse) request.GetResponse();