GDS client - Null exception during registration using Push management

[z-krejsa]

Type of issue

• [ ] Bug
• [ ] Enhancement
• [ ] Compliance
• [X] Question
• [X] Help wanted

Current Behavior

When I press the "Register" button in the "Push Management" dialog, the exception window appears with null exception (null value of endpoint), see the attached picture

Expected Behavior

Functional registration

Steps To Reproduce

• I cloned both projects, UA-.NETStandard and UA-.NETStandard-Samples, and I want to use them for testing of the GDS Push functionality. I'm using 3 application from this bundles, GDS server, GDS client and the Quickstart Reference Server.
• I started all 3 applications
• I pressed the Registration button in the top-left corner
• In the appeared dialog, I left the default selected server (opc.tcp://localhost:58810/GlobalDiscoveryServer), clicked Ok and filled the user name (sysadmin, tested also with appadmin with the same behavior) and password (demo) and clicked Ok
• I switched the Registration type to Server - Push Management and clicked to Pick Server button
• I filled the Selected Server with "opc.tcp://localhost:62541/Quickstarts/ReferenceServer" and clicked Ok
• I filled user name (sysadmin) and password (demo) and clicked Ok
• there appeared the Certificate window, I clicked Trust
• I also had to approve certificate validity in dialogs from the reference server
• the client window looked like this ...
• I clicked to Register button (bottom part of the window)
• following Exception dialog appeared ...
• I have no idea, what I'm doing wrong, just following the Readme guide
• As I found out by debugging of the GDS client the problem is in the Connect method, when checking if there's already any endpoint and session (which I'd expect because the GDS client connects to the GDS server during clicking to the Registration button); but both these variables are still NULL

I also have found that the generated GDS Client certificate has validity from 04/04/2022 to 04/04/2023, so it's not valid now and is in the rejected list of the GDS server certificates. I'm not able to influence it, other certificates (GDS server and reference OPC UA server) have correctly generated certificates with actual date.

• Do you have any idea, what could be wrong in my case, please?

Environment

- OS:Windows 10
- Environment: Microsoft Visual Studio Professional 2022 
- Runtime:
- Nuget Version:
- Component:
- Server:GDS server, Quickstart Reference Server.
- Client: GDS client

Anything else?

No response

[z-krejsa]

So I've finally found out what was wrong there was an old certificate in the Windows X509Store called CurrentUser\UA_MachineDefault. I viewed the certificates in the Windows Certificate Management Console (certmgr.msc) and deleted the old one GDS client certificate.