Hi,

Since the migration to Azure Blob Storage of our Umbraco Cloud site last month, we've been seeing a new error in the log for the live site. We get 80-100 of these a day, so it's drowning out any other errors.

It doesn't appear to cause a visible problem on the live site (no one has reported it) But I can't tie it to any particular page or piece of content so I don't know how to recreate it, and it's not happening in the dev environment.

Full trace is below.

Has anyone else seen this or know what might be causing it? If it's one piece of content causing the error how can I find it to fix it?

Thanks!

Message:
An unhandled exception occurred


Exception:
Microsoft.WindowsAzure.Storage.StorageException: The remote host closed the connection. The error code is 0x800704CD. ---> System.Web.HttpException: The remote host closed the connection. The error code is 0x800704CD.
   at System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect)
   at System.Web.Hosting.IIS7WorkerRequest.ExplicitFlush()
   at System.Web.HttpResponse.Flush(Boolean finalFlush, Boolean async)
   at System.Web.HttpResponse.Flush()
   at System.Web.HttpWriter.WriteFromStream(Byte[] data, Int32 offset, Int32 size)
   at System.Web.HttpResponseStream.Write(Byte[] buffer, Int32 offset, Int32 count)
   at System.IO.Stream.<>c.<BeginWriteInternal>b__46_0(Object )
   at System.Threading.Tasks.Task`1.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.IO.Stream.EndWrite(IAsyncResult asyncResult)
   at System.IO.Stream.<>c.<BeginEndWriteAsync>b__53_1(Stream stream, IAsyncResult asyncResult)
   at System.Threading.Tasks.TaskFactory`1.FromAsyncTrimPromise`1.Complete(TInstance thisRef, Func`3 endMethod, IAsyncResult asyncResult, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at Microsoft.WindowsAzure.Storage.Core.Util.AsyncStreamCopier`1.<StartCopyStreamAsyncHelper>d__8.MoveNext() in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Core\Util\AsyncStreamCopier.cs:line 300
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.WindowsAzure.Storage.Core.Util.AsyncStreamCopier`1.<StartCopyStreamAsync>d__4.MoveNext() in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Core\Util\AsyncStreamCopier.cs:line 228
   --- End of inner exception stack trace ---
   at Microsoft.WindowsAzure.Storage.Core.Executor.Executor.EndExecuteAsync[T](IAsyncResult result) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Core\Executor\Executor.cs:line 51
   at Microsoft.WindowsAzure.Storage.Blob.CloudBlob.EndDownloadRangeToStream(IAsyncResult asyncResult) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Blob\CloudBlob.cs:line 1180
   at Microsoft.WindowsAzure.Storage.Core.Util.AsyncExtensions.<>c__DisplayClass7.<CreateCallbackVoid>b__5(IAsyncResult ar) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Core\Util\AsyncExtensions.cs:line 120
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Umbraco.Cloud.StorageProviders.AzureBlob.FileHandler.<DownloadRangeToStreamAsync>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Umbraco.Cloud.StorageProviders.AzureBlob.FileHandler.<DownloadRangeToStreamAsync>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at Umbraco.Cloud.StorageProviders.AzureBlob.FileHandler.<ProcessRequestAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.TaskAsyncHelper.EndTask(IAsyncResult ar)
   at System.Web.HttpTaskAsyncHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result)
   at System.Web.HttpApplication.CallHandlerExecutionStep.InvokeEndHandler(IAsyncResult ar)
   at System.Web.HttpApplication.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar)
Request Information
RequestID:fa0a2289-c01e-0002-420e-c77c9b000000
RequestDate:Mon, 30 Nov 2020 11:43:56 GMT
StatusMessage:Partial Content
ErrorCode: