Pebble acme-tls/1 failed to connect on challenge, Jetty shows connections

[Bruce5051]

@Maurice-Betzel

Should the SSL handshake not suffice on the ACME server side?

No, one needs to be using TLS v1.2 or TLS v1.3; here are 3 posts on the subject.

1. Rejecting SHA-1 CSRs and validation using TLS 1.0 / 1.1 URLs
2. Email feedback: TLS 1.0/1.1 deprecation and SHA-1 deprecation
3. Questions about TLS 1.0 / 1.1 deprecation for ACME requests