Component Object Model (COM) Error – RPC_E_FULLSIC_REQUIRED 0x80010121

In this post, you’ll learn about the error “RPC_E_FULLSIC_REQUIRED 0x80010121” 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.

Full subject issuer chain SSL principal name expected from the server.