What precise version of JVM are you using?
"peer not authenticated" or "Received fatal alert: protocol_version" are
typical of TLS 1.2 server requirement upgrade with a JVM that does not support
it
I suppose that if you look at the full stack trace (-e or -X), you'll see the
exception path to SSL layer
There is a wave of server TLS 1.2 requirement upgrade, like this one from
Fastly [1]. I suppose this is an equivalent upgrade at GitHub level, I suppose
there was an announcement somewhere, I don't precisely know...
Regards,
Hervé
[1]
https://www.fastly.com/blog/phase-two-our-tls-10-and-11-deprecation-plan