Cannot synchronize new smart proxy: There was an issue with the backend service pulp_auth: SSL_connect returned=1 errno=0 state=error: certificate verify failed (error number 1)

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Problem:

Successfully installed a remote smart proxy but cannot sync its repos.

Expected outcome:

Repos available on proxy.

Foreman and Proxy versions:

Master: foreman 2.4.0-1
katello-4.0.0-0.10.rc3 (?rc3!)
Proxy: foreman 2.3.3-1
foreman-proxy-content 3.18.2-1
foreman-installer-katello 2.3.3-1
katello 3.18.2-1

Foreman and Proxy plugin versions:

Distribution and version:

CentOS 7

Other relevant data: