I'm also facing the same issue as Rossi.
My installation is on-premise in a hyper-v VM.
There's also an AD VM with a CA installed and it signs the certificate used for SSL.
My host computer is not joined to the AD VM but is able to access the service center and the SSL is verified and valid.
However, the service studio (11.14.12) throws the same warning as Rossi has provided but is able to connect.
The latest integration studio (11.14.12) throws the SSL error.
Attached is the log and the screenshot is below:
