We have a class in our website that calls Fedex's web servers to receive quotes using an XML interface. (This is part of our check out processes). Over the past few days we've started receiving Disposed Object exceptions randomly during our HttpRequest. The class that is throwing the exception is actually in System.Net.Security.SslState, which is deep inside Microsoft's framework library and not called directly. We have never had problems like this before, nor can we find references to it on the Internet. Fedex recently upgraded their systems, but claims we have done something to break our code, whereas the only change we've made in recent weeks was moving from .NET 1.1 to .NET 2.0. We've been running on this code for over 2 years and haven't had a problem until this week!

The exception is below, and a snippet of code is at the bottom. You can see we just write to the request, and then call BeginGetRequestStream to start the request in async fashion.

If someone could find a solution to this it would be great, we lost $15,000 alone today in orders due to this problem, and probably $50,000 or more over the past week.

message=Cannot access a disposed object.
Object name: 'SslStream'.

stack=
at System.Net.Security.SslState.ValidateCreateContext(Boolean isServer, String targetHost, SslProtocols enabledSslProtocols, X509Certificate serverCertificate, X509CertificateCollection clientCertificates, Boolean remoteCertRequired, Boolean checkCertRevocationStatus, Boolean checkCertName)
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.InternalWrite(Boolean async, Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
at System.Net.ConnectStream.Write(Byte[] buffer, Int32 offset, Int32 size)
at Atacomm.Shipping.Fedex.FedexRateQuote.HttpRequestCallback(IAsyncResult ar)
at System.Net.LazyAsyncResult.Complete(IntPtr userToken)
at System.Net.ContextAwareResult.CompleteCallback(Object state)
at System.Threading.ExecutionContext.runTryCode(Object userData)
at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Net.ContextAwareResult.Complete(IntPtr userToken)
at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken)
at System.Net.HttpWebRequest.InvokeGetRequestStreamCallback()
at System.Net.HttpWebRequest.EndWriteHeaders_Part2()
at System.Net.HttpWebRequest.EndWriteHeaders_Part2Wrapper(Object state)
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state)

state.httpRequest
= (HttpWebRequest)System.Net.WebRequest.Create("https://gateway.fedex.com:443/GatewayDC");

state.httpRequest.Method = "POST";
state.httpRequest.ContentType = "application/x-www-form-urlencoded";

....

state.httpRequest.Timeout = 15000; // 15 seconds in milleseconds
state.httpRequest.ContentLength = outstr.Length;
state.httpRequestData = outstr;

IAsyncResult ar = state.httpRequest.BeginGetRequestStream(new AsyncCallback(HttpRequestCallback),state);

public static void HttpRequestCallback(IAsyncResult ar)
{
FedexHttpState httpRequestState = (FedexHttpState) ar.AsyncState;
System.IO.Stream streamRequest = null;
try{
streamRequest = httpRequestState.httpRequest.EndGetRequestStream(ar);
streamRequest.Write(System.Text.UTF8Encoding.UTF8.GetBytes(
httpRequestState.httpRequestData),0,httpRequestState.httpRequestData.Length);

httpRequestState.httpResponse = (System.Net.HttpWebResponse)httpRequestState.httpRequest.GetResponse();
}
catch(Exception e)
{
EventLog Log = new EventLog();
Log.Source = "ResvNet Fedex RateQuote";
Log.WriteEntry(e.Message, EventLogEntryType.Error);

if (streamRequest!=null)
streamRequest.Close();
return;
}
streamRequest.Close();

.....
}

Above is our Async request/response handler. You can see we grab the exception and throw it into our event log.