SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443

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:

LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443

Same issue with npm i command Even when I try to install brew like so:

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

I also tried the alternative setup: same.

Solution 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.

Solution 2:

Same problem here, it turned out to be my incorrectly configured proxy settings, here's how to check and remove them.

First open your git config file.

vi ~/.gitconfig

and find out whether the [http] or [https] sections are set.

I used to set proxies for git due to slow access to Github in China, however, lately I changed my local proxy ports but I forgot my git settings.

If you have incorrect proxy settings and decide to remove it, simply execute:

git config --global --unset http.proxy
git config --global --unset https.proxy

Things will work just fine.

Solution 3:

I just turned off VPN and it solved the issue.

Solution 4:

Since you're using LibreSSL, try re-installing curl with OpenSSL instead of Secure Transport.

Latest Brew

All options have been removed from the curl formula, so now you need to install via:

brew install curl-openssl

Older Brew

Install curl with --with-openssl:

brew reinstall curl --with-openssl

Note: If above won't work, check brew options curl to display install options specific to formula.

Here are few other suggestions:

• Make sure you're not using http_proxy/https_proxy.
• Use -v to curl for more verbose output.
• Try using BSD curl at /usr/bin/curl, run which -a curl to list them all.
• Make sure you haven't accidentally blocked curl in your firewall (such as Little Snitch).
• Alternatively use wget.

Solution 5:

A simple restart fixed it for me. I'm not sure what was the problem since I work with so much software but I have a feeling it was the VPN software or maybe the fact I put my laptop in sleep a lot and some file was corrupted. I really don't know but the restart fixed it.