Sync errors - RPM1004: Error retrieving metadata: A connection error occurred

Hi all.

We are facing connection errors while trying to sync official Red Hat repositories from CDN Redhat!! This problems started to happen suddenly after months running without problems.

Scenario:

Satellite 6.4.2, accessing CDN via proxy, with no SSL Inspection enabled on the environment, we are able to reach cdn but in some way pulp cannot verify SSL server certificate.

We will be very greatfull if someone can help.

Best regards.n