Unable to join a Domain Controller to SPP

Goodmorning,

I have a problem joining an AD Domain Contoller to SPP in the asset tab. I have successfully joined the Active Directory service to SPP on the page Identity and Authentication, but when i try to join the domain controller in the asset tab SPP return the error: 

DCName: Directory server 'ldaps:\\DCName@domain:636 (Read-Only) (Verify SSL)' is not reachable.
How can i resolve?
Thank you,
Samuele Fochi

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