curl: (56) TCP connection reset by peer
Failed to download https://github.com/technomancy/leiningen/releases/download/2.5.1/leiningen-2.5.1-standalone.zip (exit code 56)
It's possible your HTTP client's certificate store does not have the
correct certificate authority needed. This is often caused by an
out-of-date version of libssl. It's also possible that you're behind a
firewall and haven't set HTTP_PROXY and HTTPS_PROXY.