Great, the certs seem to be in place now, which rules out expired or missing CA certificates as the culprit. 
Next, let’s verify that your machine can manually connect to the troubled URL. Use this:
curl -v https://cdn-repo.c7rs.com
This debug mode will give us a lowdown on what’s failing during the handshake. Let me know the output (as text, not a screenshot/link).
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