更新
20170319
该方法适用Openwrt、LEDE以及Linux服务器。

使用chromebook secure shell 连接 openwrt时出现如下问题:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
dd:3b:ad:5f:c5:5c:fc:09:58:21:df:ca:f5:23:3d:be.
Please contact your system administrator.
Add correct host key in /.ssh/known_hosts to get rid of this message.
Offending RSA key in /.ssh/known_hosts:3
RSA host key for 192.168.1.1 has changed and you have requested strict checking.
Host key verification failed.
NaCl plugin exited with status code 255.
(R)econnect, (C)hoose another connection, or E(x)it?

解决方法如下：

1.打开secure shell；
2.尝试登录openwrt；
3.按 ctrl+shift+j 组合键，调出控制台；
4.输入如下命令：

term_.command.removeAllKnownHosts()

回车后，可以看见 true；
5.重新连接openwrt，出现
Are you sure you want to continue connecting (yes/no)?
时，输入

yes

6.输入登录密码…