原因是22端口被防火墙屏蔽，具体是哪个防火墙尚未找到，可以参考官方的建议配置~/.ssh/config，来使用备用服务器端口。
Host gitlab.com Hostname altssh.gitlab.com User git Port 443 PreferredAuthentications publickey IdentityFile ~/.ssh/id_rsa
ssh: connect to host gitlab.com port 22: Operation timed out
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