Hi,

I just encountered the same exception in an application using 5.53.225.1 and ReadMultiple after running uninterrupted without any issues for about 4 months.
The servers that are being connected to are not always online so timeouts are expected; however, I have never seen any issues before. Unfortunately, I have not been able to reproduce the issue since the occurrence.

Regards

Hi,Support
Thank you for your advice.
My program has been running quite stably since I followed your useful suggestion.So it seems the problem has been resolved.I would keep following the progress of program and feedback as soon as possible.


Best regards.

Hi,Support
I have to say sorry for I have not described my problem clearly . I make a C# Winform Program to connect to many OpcUa servers which are in different computers.The problem is that When I subscribe to hundreds of tags by using the SubscribeMultipleMonitoredItems() , considering the number of the events ,so I use callback methods to handle these events.

But then a serious error comes out and I just could not catch it ,which windows error log shows that it happens at OpcUa.Bindings.TcpAsyncOperations.OnTimeOut(System.Object).Cause it does not reflect my error in my code (I can not debug this out) , I wanna know how it happened and whether it is internal error in your tools.

The windows log like this :
exception: System.ObjectDisposedException
Trace:
System.Runtime.InteropServices.SafeHandle.DangerousAddRef(Boolean ByRef)
System.StubHelpers.StubHelpers.SafeHandleAddRef(System.Runtime.InteropServices.SafeHandle, Boolean ByRef)
Microsoft.Win32.Win32Native.SetEvent(Microsoft.Win32.SafeHandles.SafeWaitHandle)
System.Threading.EventWaitHandle.Set()
Opc.Ua.Bindings.TcpAsyncOperation`1[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].InternalComplete(Boolean, System.Object)
Opc.Ua.Bindings.TcpAsyncOperation`1[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].OnTimeout(System.Object)
System.Threading.TimerQueueTimer.CallCallbackInContext(System.Object)
System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
System.Threading.TimerQueueTimer.CallCallback()
System.Threading.TimerQueueTimer.Fire()
System.Threading.TimerQueue.FireNextTimers()
System.Threading.TimerQueue.AppDomainTimerCallback()

Hi ,Support

I met a big problem about OpcLabs tools ,which is about OpcUa stuff.When I use methods (Writemultiple ,ReadMultiple,or SubscribeMultipleMonitoredItems),a same problem happens.Please check the files in the attachment,a windows error shows that it is a internal error of opclabs dlls.So I actually wonder why and how it happened, wish your feedback as soon as possible !