Configuring WAC on standalone management desktop

I'm trying to configure WAC on a standalone notebook to be used as management station for different customer installation.

After installing WAC on the notebook I've followed, I think, all the required steps to configure the connection between my computer to one customer's node.

I've configured Winrm on my computer and on the customer node.

I've generated a self-signed cert on the node with the CN set as the FQDN used to connect from the WAC.

I've imported the cert on the trusted root cert on the WAC computer.

I've checked the connectivity with the Test-WsMan from the wac to the server and it works.

However from the WAC console the connection to the node fails with the "ssl connection " error.

Has anyone been able to configure it in such way ?

thanks