UnobservedTaskException

[LukeOrdelmans]

When calling await InitializeConnection() before the PLC is up and running I get a UnobservedTaskException:

Caught "UnobservedTaskException at System.Threading.Tasks.ValueTask+ValueTaskSourceAsTask"
System.AggregateException: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. (Kan geen verbinding maken omdat de doelcomputer de verbinding actief heeft geweigerd.)
---> System.Net.Sockets.SocketException (10061): No connection could be made because the target machine actively refused it.
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token)
at System.Threading.Tasks.ValueTask.ValueTaskSourceAsTask.<>c.<.cctor>b__4_0(Object state)
--- End of inner exception stack trace ---

When debugging it seems to originate close to or from awaiting the connection state:

private async Task DoInitializeConnection(bool waitForConnection, CancellationToken token)
{
     ...
     await s7Connector.ConnectionState
                .FirstAsync(c => c == Enums.ConnectionState.Connected)
                .ToTask(token);
     ...
}

note that in order to actually see the exception you'd need to register to the TaskScheduler.UnobservedTaskException event