Cygwin set up ssh

cygwin set up ssh problem in Windows 8.1

In order to directly use Linux environment and hadoop development on Windows 8.1, install cygwin, and set ssh without password log in.

But after normal ssh-keygen is copied to authorised_keys, the login prompts:

Permissions 0660 for /home/***/.ssh/id_rsa are too open. It is required that your private Key files are NOT accessible by others.

This means that the permissions of the key file are too loose, so you want to narrow the permissions, but no matter how chmod can not receive the group and other rw permissions.

After a few searches, I found out that it was a problem I encountered on AIX in my work N years ago, that is, the group of files is not, or the reason why the group is displayed as None in cygwin. The solution is to give the group first, simple and rude chgrp Users to group a common user, and then change the permissions is no problem.