runtime: Cannot access a disposed object. Object name: 'SslStream'.

I have an issue with SendAsync in .NET Core 2.2. When doing a lot of requests, I encounter the exception on some of them. I have gotten the error on different requests, for example on a small GET request. However I do have to mention that asynchronously I’m also doing other requests, for example POST (with content smaller than 4MB).

This issue is similar to https://github.com/dotnet/corefx/issues/34033 , but not the same. Mine doesn’t mention the handshake in the stacktrace and the other one should be fixed since Core 2.1 (and I use 2.2).

The operation was canceled.
   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithNtConnectionAuthAsync(HttpConnection connection, HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.Logging.LoggingHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.Logging.LoggingScopeHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncUnbuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at [details of own code omitted]

Inner exception:
The read operation failed, see inner exception.
   at System.Net.Security.SslStreamInternal.ReadAsyncInternal[TReadAdapter](TReadAdapter adapter, Memory`1 buffer)
   at System.Net.Http.HttpConnection.FillAsync()
   at System.Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync(Boolean foldedHeadersAllowed)
   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)

Inner Exception:
Cannot access a disposed object.
Object name: 'SslStream'.
   at System.Net.Security.SslState.ThrowIfExceptional()
   at System.Net.Security.SslState.CheckThrow(Boolean authSuccessCheck, Boolean shutdownCheck)
   at System.Net.Security.SslStreamInternal.ReadAsyncInternal[TReadAdapter](TReadAdapter adapter, Memory`1 buffer)

About this issue

Original URL
State: open
Created 5 years ago
Reactions: 10
Comments: 23 (17 by maintainers)

Most upvoted comments

I would say based on this stack trace, the only part we need to fix is the ‘ObjectDisposedException’. We should be able to detect when the SslStream is being closed by upstack code (in this case due to a cancellation) and prevent SslStream from accessing its own objects while closing down.

davidsh on Mar 5, 2020

Triage: We should see if we can detect it and avoid throwing. If not, then it is likely confusing to customers, in which case we may want to mask it / not include as inner exception of TaskCanceled.

Note: We have seen more customers running into this and being confused in the past.

karelz on Apr 16, 2020