Recently, we have been having a problem with the ECDSA keys for our Spear nodes and Login nodes. If you have been using a recent version of Debian, Ubuntu, CentOS, or Redhat, you may have seen a message similar to the following when trying to connect to our services:

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@ 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 the ECDSA host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
5c:9b:16:56:a6:cd:11:10:3a:cd:1b:a2:91:cd:e5:1c.
Please contact your system administrator.
Add correct host key in /home/user/.ssh/known_hosts to get rid of this message.
Offending key in /home/user/.ssh/known_hosts:1
ECDSA host key for ras.mydomain.com has changed and you have requested strict checking.
Host key verification failed.

We have since corrected the issue, and users will no longer see this message when connecting to hpc-login.rcc.fsu.edu or spear-login.rcc.fsu.edu services. If you still see this message, you may need to purge your locally cached keys one more time before connecting again. Refer to our documentation page for instructions on how to do so