Lot of WebSocketException error in IIS

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I have a lot of error in windows event.

The application runs on an IIS 10 server with about 1500 concurrent connections.
I have about 100 errors per hour from the notice below.
Any ideas?

 

Thanks.

 

Event code: 3005
Event message: Excepción no controlada.
Event time: 20/10/2021 10:31:40
Event time (UTC): 20/10/2021 8:31:40
Event ID: 755f98d109eb4ad3bf7d37d27ca2fae4
Event sequence: 117709
Event occurrence: 128
Event detail code: 0

Application information:
Application domain: /LM/W3SVC/2/ROOT-1-132791597594938010
Trust level: Full
Application Virtual Path: /
Application Path: C:\inetpub\gpcat.zzzzzzz.com\
Machine name: GPCAT

Process information:
Process ID: 6228
Process name: w3wp.exe
Account name: IIS APPPOOL\GPCat

Exception information:
Exception type: WebSocketException
Exception message: Se ha alcanzado el final del archivo
en System.Web.WebSockets.WebSocketPipe.<>c__DisplayClass9_0.<ReadFragmentAsync>b__0(Int32 hrError, Int32 cbIO, Boolean fUtf8Encoded, Boolean fFinalFragment, Boolean fClose)
— Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción —
en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
en System.Web.WebSockets.AspNetWebSocket.<DoWork>d__45`1.MoveNext()
— Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción —
en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
en System.Web.WebSockets.AspNetWebSocket.<>c__DisplayClass36_0.<<ReceiveAsyncImpl>b__0>d.MoveNext()
— Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción —
en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
en Wisej.Core.HttpHandler.<ProcessWebSocketRequest>d__18.MoveNext()
— Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción —
en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
en System.Web.WebSocketPipeline.<ProcessRequestImplAsync>d__9.MoveNext()

Request information:
Request URL:
Request path:
User host address:
User:
Is authenticated: False
Authentication Type:
Thread account name: IIS APPPOOL\GPCat

Thread information:
Thread ID: 358
Thread account name: IIS APPPOOL\GPCat
Is impersonating: False
Stack trace: en System.Web.WebSockets.WebSocketPipe.<>c__DisplayClass9_0.<ReadFragmentAsync>b__0(Int32 hrError, Int32 cbIO, Boolean fUtf8Encoded, Boolean fFinalFragment, Boolean fClose)
— Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción —
en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
en System.Web.WebSockets.AspNetWebSocket.<DoWork>d__45`1.MoveNext()
— Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción —
en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
en System.Web.WebSockets.AspNetWebSocket.<>c__DisplayClass36_0.<<ReceiveAsyncImpl>b__0>d.MoveNext()
— Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción —
en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
en Wisej.Core.HttpHandler.<ProcessWebSocketRequest>d__18.MoveNext()
— Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción —
en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
en System.Web.WebSocketPipeline.<ProcessRequestImplAsync>d__9.MoveNext()

Custom event details:

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Best Answer
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Those are normal entries in the event viewer generated by the IIS websocket system when the connection is closed. You didn’t get any exception or error in the application.

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