OpenSSL SSL_ERROR_SYSCALL in connection to raw.githubusercontent.com:443

If you're on WSL 2. Just add the virtual Hard Disk as a trusted application in Kasperky for "Encrypted Traffic Scanning".Click on Trusted Applications Click of Trusted Applications. Navigate to User/YourUserFolder/AppData/Packages/YourDistroNameFolder/LocalState/YourDistroVHDKfile. Add and save.

In my case, this problem will happens on git, nvm, rbenv and asdf, etc

The root cause is these problems tries to download some file for you automatically, and you are behind some GFW or something else that will pollute your DNS.

Don't try to modify the /etc/hosts file. try this:

1. under stand the related bash file
2. find the source code where it used the curl command
3. manually download the resource and comment out the curl command.

e.g. in asdf , when you are trying to asdf install erlang, it will first check kerl if exists, and the version is matched. if not, it will download kerl like this:

and the download_ker() function looks like:

download_kerl() {
    # Print to stderr so asdf doesn't assume this string is a list of versions
    echo "Downloading kerl..." >&2
    local kerl_url="https://raw.githubusercontent.com/kerl/kerl/${KERL_VERSION}/kerl"
    curl -Lo "$(kerl_path)" $kerl_url
    chmod +x "$(kerl_path)"
}

so, let's just download the file ker_url listed above, and then put it into the correct position, and then chmod +x <file>, then re-run the asdf install erlang, evething would be fine.