SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443

Question

Since a few days I got an issue with Mac OS High Sierra 10.13.3 : When I run a git clone like git clone github.com/xxx.git failed it print:

Answer 1

I had this similar error when using wget ..., and after much unfruitful searching in the Internet, I discovered that it was happening when hostnames were being resolved to IPv6 addresses. I discovered this by comparing the outputs of wget ... in two machines, one was resolving to IPv4 and it worked there, the other was resolving to IPv6 and it failed there.

So the solution in my case was to run networksetup -setv6off Wi-Fi on macOS High Sierra 10.13.6. (I discovered this command in this page).

Hope this helps you.