windows ssh远程登录阿里云遇到permissions are too open的错误

我试图用ssh -i 命令远程登录阿里云时，遇到如下错误：

Permissions for ‘private-key.ppk’ are too open. It is required that your private key files are NOT accessible by others. This private key will be ignored.

: Remove All Users, except for Owner :: cmd /c icacls %key% /c /t /remove Administrator “Authenticated Users” BUILTIN\Administrators BUILTIN Everyone System Users

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:: Verify :: cmd /c icacls %key%