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

The github project was suddenly unavailable with Git today, error reporting:
Fatal: unable to access “https://github.com/dmlc/xgboost.git/” : OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to github.com: 443
It doesn’t work in all kinds of ways. I found many ways on the Internet:
https://blog.csdn.net/daerzei/article/details/79528153
 
https://stackoverflow.com/questions/49345357/fatal-unable-to-access-https-github-com-xxx-openssl-ssl-connect-ssl-error
 
If that doesn’t work, try switching to a network, such as a hotspot or your own broadband connection, because you may be using a company Intranet and have a proxy set up.
If not, I don’t know what to do

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