Hello, I've been having the same problem, but I do have some more details and I hope you might be able to provide me a clearer picture of what is going wrong, as I haven't been able to find the root of this problem. In the first attached photo, you can see I'm having the same error, just with port 4880 now. In the second photo you can see that port 4880 is listening, and I've confirmed that the PID of port 4880 is the OPC server.
I tried testing my client code a bit and found something interesting. When subscribing to a node we first test with an EasyUAClient.Read operation and then subscribe, which looks like this:
private int Subscribe(UANodeDescriptor NodeDescriptor, int samplingRate, EasyUADataChangeNotificationEventHandler callBack = null)
{
//NOTE: This is the OPC server address on the CM100
UAEndpointDescriptor endpointDescriptor = "opc.tcp://" + PCNameTextBox.Text + ":4880/CM100 OpcUa";
//Test if the endpoint and node are real and point to a value
// If it's not real the .Read() will throw a UAException
// This will be caught in subscribeAll()
//DEV NOTE: I don't like this test method but it works for now
CM100Client.Read(endpointDescriptor, NodeDescriptor);
//It's a real subscribtion so we can subscribe
return CM100Client.SubscribeDataChange(endpointDescriptor, NodeDescriptor, samplingRate, callBack);
}
If I comment out the read operation, I will get a different error at runtime:
System.NullReferenceException was unhandled by user code
HResult=-2147467261
Message=Object reference not set to an instance of an object.
Source=DataViewUI
StackTrace:
at DataViewUI.Views.DemoLiveDataUserControl.OnAPPNChanged(UAAttributeData attributedata) in D:\CombinedUI\DataViewUI\Views\Live Data\DemoLiveDataUserControl.xaml.cs:line 453
at DataViewUI.Views.DemoLiveDataUserControl.<SubscribeALL>b__57_0(Object sender, EasyUADataChangeNotificationEventArgs Eventargs) in D:\CombinedUI\DataViewUI\Views\Live Data\DemoLiveDataUserControl.xaml.cs:line 349
at OpcLabs.BaseLib.Widgets.NotifyingWidget.<>c__DisplayClass44_0`1.<Callback>b__0()
at OpcLabs.BaseLib.Widgets.NotifyingWidget.SafeCallback(String name, Action action)
InnerException: Is there any additional information you can give us about what our specific problem is or how exactly our server would be misconfigured?
Thank you for your continued help.
