After installing AppDefense Guest Module on Windows 2008R2, signature verification for glxgi and giappdef drivers fails.

Problem

The problem occurs only for Windows Server 2008R2.

Cause

Windows 2008R2 does not recognize the WHQL SHA256 signature. glxgi and giappdef drivers are signed with SHA256. As a result, the guest VM fails to validate the SHA256 signature.

Solution