SourceTree 拉取github资源包时报错：fatal: unable to access 'https://github.com/xxx.git/': OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443 --解决办法

git -c diff.mnemonicprefix=false -c core.quotepath=false --no-optional-locks fetch --no-tags origin fatal: unable to access 'https://github.com/dotnetcore/xxx.git/': OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443 完成时带有错误，见上文。