Permissions 0644 for ‘/root/.ssh/id_rsa’ are too open处理

如果出现 Permissions 0644 for ‘/root/.ssh/id_rsa’ are too open. 等错误显示了，原来只要把权限降到0600就ok了
输入命令

chmod 0600 /root/.ssh/id_rsa

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然后就可以密钥登陆了

sftp  -oPort=50022  x@IP

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转自：http://www.cppblog.com/gezidan/archive/2011/08/19/153826.html