Dear all,
I am trying to implement CA-signed certificate on arcgis server 10.4.1. I have been followed all the steps from "Configure HTTPS using a new CA-signed certificate—ArcGIS Server Administration (Windows) | ArcGIS Enterprise "
however, when I am trying to import the ca signed certificate, I am getting error. "Importing CA certificate failed"

which section do I need to check to resolve this issue?
FYI, environment is as follows: windows server, IIS 8.5