I encountered an issue recently where my main server that is the repository of all my TV recordings had been rebuilt. It was only after a bit of standard troubleshooting that I managed to figure out that the reason for being unable to connect was because the SSH key had changed.
When connecting from the Pi to the main server, I was hit with this error:
OpenELEC:~ # ssh -oPort=44 -l john 192.168.1.44
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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 ED25519 key sent by the remote host is
SHA256:long_spangly_key
Please contact your system administrator.
Add correct host key in /storage/.ssh/known_hosts to get rid of this message.
Offending ED25519 key in /storage/.ssh/known_hosts:1
ED25519 host key for [192.168.1.44]:44 has changed and you have requested strict checking.
Host key verification failed.
I edited the requisite file in /storage/.ssh/known_hosts and removed the offending key on line 1, using my trusty vi editor.
I attempted to connect again:
OpenELEC:~ # ssh -oPort=44 -l john 192.168.1.44
The authenticity of host '[192.168.1.44]:44 ([192.168.1.44]:44)' can't be established.
ECDSA key fingerprint is SHA256:long_spangly_key
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[192.168.1.44]:44' (ECDSA) to the list of known hosts.
john@192.168.1.44's password:
Welcome to Linux Mint 17.1 Rebecca (GNU/Linux 3.13.0-37-generic x86_64)
Welcome to Linux Mint
* Documentation: http://www.linuxmint.com
No mail.
Last login: Sat Apr 16 20:26:46 2016 from ch1-fw1-dip.uk.clara.net
$
Success!
I am now able to successfully browse all of my TV programs using ssh/sftp.
(NOTE - key value in the above example has been obfuscated - long_spangly_key)
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