Article ID: 970682 - View products that this article applies to.
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When you try to deploy a Visual Studio Tools for Office system (VSTO) Version 3.0 solution with a certificate issued by an Intermediate Certificate Authority, end users will see an Trust Prompt with "Unknown Publisher" even though the component is duly signed with a Certificate that chains up to a Root Certificate Authority.
The same certificate can be used to sign an executable application like Winforms or WPF application deployed through ClickOnce and the Trust Prompt for these applications will be able to verify the publisher identity successfully. However, if you try to view the certificate details for these applications types, the certificate chain hierarchy will not be visible and the Certificate Status in the details window will display "The issuer of this Certificate could not be found."
The VSTO v3.0 Runtime (including 3.0 SP1) cannot verify a publisher’s identify for certificates that chain to a Trusted Certificate Authority via an Intermediate Certificate Authority. This is a limitation in the underlying API used by the VSTO v3.0 Runtime and does not affect the ClickOnce deployment of other types of applications.
While the Trust Prompt for an executable application like Winforms or WPF application can successfully display the Publisher Name, the details dialog associated with these application types has a similar limitation dealing with certificates issued by Intermediate Certificate Authorities and cannot completely construct the certificate chain hierarchy back to the Root Certificate Authority.
The workaround to this issue is to include the Intermediate Certificate Authorities’ certificate on all end user machines where the application will be installed. As of now the issue is reported only with the handling of Thawte certificate and would require that Thawte intermediate certificate be installed on the end users machine.
How to: Add a Trusted Publisher to a Client Computer for ClickOnce Applications
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Article ID: 970682 - Last Review: January 16, 2015 - Revision: 1.0