问题背景： MacOS上使用sourcetree提交代码到gitee仓库时，突然一直提示下图中的问题
git -c color.branch=false -c color.diff=false -c color.status=false -c diff.mnemonicprefix=false -c core.quotepath=false -c credential.helper=sourcetree fetch gitee
kex_exchange_identification: Connection closed by remote host
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
Completed with errors, see above
找了一圈文档并没有解决，最后在本地的 hosts 文件中发现有一条 gitee.com 的记录，
/private/etc/hosts
删掉后发现就能正常访问了。 （尝试之前请先备份hosts文件）
