Component Object Model (COM) Error – CERT_E_UNTRUSTEDROOT 0x800B0109

In this post, you’ll learn about the error “CERT_E_UNTRUSTEDROOT 0x800B0109” that is returned when working with COM based APIs or libraries in Windows.

COM Error Message


What is COM?

Microsoft’s COM stands for Component Object Model. Component Object Model (COM) is a networked, object-oriented framework for building interoperable binary software components.   Microsoft’s OLE (compound documents), ActiveX (Internet-enabled components), and other products are built on the COM base technology.

Error Description

Below is the description of this COM Error.

A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider.