I have a number of ASP.NET websites and a webservice that use the same code to "login" to a third party website. This includes basically using a WebRequest to do a HTTP POST to the login page of the website with my credentials, storing the resulting cookie in a CookieContainer and using that CookieContainer in any following WebRequests to authorize my website to pages on the third party website.
The code is basically as follows:
public LoginResults Login()
{
// Create the webrequest
var request = CreateInitialWebRequest(LOGIN_URL);
request.AllowAutoRedirect = false;
// Set the cookiecontainer, which will be filled with the authentication cookies
this.cookieContainer = new CookieContainer();
request.CookieContainer = this.cookieContainer;
// Set the username and pw in a HTTP POST call
SetPostContent(request, string.Format(LOGIN_PARAMETERS, this.Username, this.Password));
// Read the response
using (var httpWebResponse = (HttpWebResponse)request.GetResponse())
{
using (var responseStream = httpWebResponse.GetResponseStream())
{
// Omitted:
// read response and determine if login was successful
}
}
}
private HttpWebRequest CreateInitialWebRequest(string uri)
{
var request = (HttpWebRequest)WebRequest.Create(uri);
ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
return request;
}
private HttpWebRequest CreateWebRequest(string uri)
{
var request = this.CreateInitialWebRequest(uri);
request.CookieContainer = cookieContainer;
request.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-ms-application, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-ms-xbap, application/x-shockwave-flash, */*";
request.UserAgent = "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506; .NET CLR 3.5.21022)";
request.Method = "GET";
request.Timeout = 10000; // 10 sec
return request;
}
private static void SetPostContent(HttpWebRequest req, string postData)
{
req.Method = "POST";
byte[] bytes = new ASCIIEncoding().GetBytes(postData);
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = (long)bytes.Length;
((WebRequest)req).GetRequestStream().Write(bytes, 0, bytes.Length);
((WebRequest)req).GetRequestStream().Close();
}
This code has been working for a LONG time (months, over half a year). Since this weekend it has started failing very often (90% of the time I estimate, but not 100% of the time). The error I keep seeing is: System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: The handshake failed due to an unexpected packet format. The stack-trace is as follows:
System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: The handshake failed due to an unexpected packet format.
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
at System.Net.TlsStream.CallProcessAuthentication(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result)
at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.ConnectStream.WriteHeaders(Boolean async)
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)
at System.Net.HttpWebRequest.GetRequestStream()
at iRacingForumService.HttpPost.SetPostContent(HttpWebRequest req, String postData)
at iRacingForumService.HttpPost.Login()
When I google this error the only solution I keep seeing is to disable the KeepAlive property of the WebRequest and/or setting the ProtocolVersion to HttpVersion10. I tried both (in every combination possible) and nothing helps.
The error does not appear always, but when it does appear I can keep trying all I like, I will keep getting the error again and again and again. If I leave it for a few minutes and try again, I have a chance that it will work (and once it does, it will keep working for a while).
The strange part is that I did not change anything on my end; this code has been running for months without problems. It is entirely possible that the third party website changed something on their end, and/or my webhosting provider changed something. But just in case I can do something to remedy this problem I wanted to ask if I am doing something wrong.
I could contact the third party website (will probably not get a response) or my webhosting, but I'd need a better idea of what exactly is going wrong because just throwing this error to them will probably not help them.
So, is there anything I can do, or is there a good reason why I am suddenly seeing this error across all of my websites (they are all connecting to the same third party site)?
Thanks
