"Can't verify the remote computer ID. Do you connect?" message when user accesses by RDP

Document ID : KB000107071
Last Modified Date : 20/07/2018
Show Technical Document Details
Question:
Target device is Windows. When the user access the target server by RDP, the Info message box shows up. 
 
Can't verify the remote computer ID. Do you connect? 
Could not authenticate the remote computer because of the security certification problem 

Certificate info: 
Server name: <hostname>.<domain name> 
Issuer: <hostname>.<domain name>
Validation period: From 2018/05/04 To 2018/11/03 

Certificate errors: 
During the verification of the remote computer certificate, the following error occurred. 

This certification is not from the trusted certification organization.

In the dialog message, there is the server name and issuer, and they have the [hostnme.domain name]. But this device does not join the domain and not registered the DNS. 

From where are those information obtained?
Environment:
CA Privileged Access Manager r3.2.1 
 
Answer:
It is just received a self-signed certification's information from the target server's self-signed certification and PAM just shows up.