Getting security warning Unknown publisher issue while install the .exe or update the application using click once

Question

Getting security warning Unknown publisher issue while install the .exe or update the application using click once

Bharathiraja Kethappan 0

Dear Support,

I have created a Windows application using WPF and deployed it to a server location using Click-Once. It was properly digitally signed and used by everyone in the organization. However, recently we have started getting the "Unknown Publisher" security warning and "Publisher can't be verified" message whenever a new version is published and users update to the latest version.

I checked the digital signature and confirmed that it has not expired. We haven't changed any configuration settings either. This warning issue has only started appearing recently.

I suspect this could be related to a recent Microsoft OS update, but I'm not sure.

I have tried all the recommended solutions available in various forums, and we have already followed them. Can anyone please provide guidance on how to resolve this issue?

Thanks,

Bharathi.

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Answer 1

Hi,@Bharathiraja Kethappan. Welcome to Microsoft Q&A.

Open certmgr.msc (C:\Windows\System32), add your certificate in Trusted Root Certification Authorities->Certificates to make it a trusted certificate.

A simple example: When publishing with ClickOnce, you create a certificate by Create test certificate

The certificate will be stored in the Personal->Certificates location (you could confirm it by the creation time).

At this point you could select it and paste it into Trusted Root Certification Authorities->Certificates by right clicking->Copy.

Now you will not get the Unknown Publisher error when installing the application.

Of course, there are other ways to add trusted certificates (commands, X509Store) that you could refer to:

Add trusted publisher to client box (ClickOnce) - Visual Studio (Windows) | Microsoft Learn

X509Store Class (System.Security.Cryptography.X509Certificates) | Microsoft Learn

Finally, you should ensure that the certificate you update your application with is consistent with the locally stored trusted certificates.

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Anonymous

2024-12-20T01:00:34.05+00:00

Hi, @Bharathiraja Kethappan.

Are there any more updates to this question? Is my answer helpful to you? If the above reply could solve your problem, you could accept it as the answer. This will help more community members who have similar problems.

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Getting security warning Unknown publisher issue while install the .exe or update the application using click once

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