When I run the git push command, I get the error:

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$ git push origin main 
kex_exchange identification: Connection closed by remote host
connection closed by 20.205.243.166 port 22

Next, I checked the ssh key I found the following output:

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$ ssh -T github.com
kex_exchange identification: Connection closed by remote host
connection closed by 20.205.243.166 port 22

I tried many solutions including changing the port to 443, turning off the VPN, and regenerating the ssh key, none of which worked.

Finally, I found that I can’t successfully run the curl google.com command, but can successfully run the curl baidu.com command. I guess that my proxy has errors. However, the browser proxy is functioning normally, so I guess there’s something wrong with my terminal proxy.

Run the following command:

$ curl ipinfo.io

Cities are shown in China. Now the problem is very clear, that is, the terminal proxy is not turned on.

If you use VPN, then the problem is most likely that you do not have a terminal proxy enabled.

When I turned on the terminal proxy, the problem was successfully solved. I use the macOS system. In macOS, the success of the browser proxy does not mean the success of the terminal proxy. For example, my proxy port is 7890, I run the following command:

export https_proxy=http://127.0.0.1:7890 http_proxy=http://127.0.0.1:7890 all_proxy=socks5://127.0.0.1:7890

If you use oh-my-zsh, you can use the plugin zsh-osx-autoproxy to automatically set the terminal proxy.

git clone https://github.com/sukkaw/zsh-osx-autoproxy ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-osx-autoproxy

echo "plugins+=(zsh-osx-autoproxy)" | tee -a .zshrc

References