One of the things that is not implemented in the Secure Shell Chrome extension is the ability to remove know_host fingerprints which alert you if the fingerprint for a specific IP address has changed.

However there are times when you upgrade a systems and this need to be done.

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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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 ECDSA key sent by the remote host is
d6:be:12:7e:22:23:c3:e1:56:30:d6:cd:65:b7:ab:42.
Please contact your system administrator.
Add correct host key in /.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /.ssh/known_hosts:7
ECDSA host key for xxxxxxxxxxxxx.yyy.au 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?

Just got myself (actually it’s for our Office Manager back in OZ) one of these Chromebooks while in Europe (since Google Australia with their absolutely hopeless hardware strategy do not seem to be able to ship any devices – Nexus 4 anyone ?) .

Since the first days turned out to be a bit of a frustrating experience, I thought I share some of the findings as I had a hard time finding much useful info on troubleshooting ChromeOS.