Teach fingerprints

The first time you login to Teach cluster you'll be asked to confirm the ssh host key fingerprints:

$ ssh teach.scinet.utoronto.ca
The authenticity of host 'teach.scinet.utoronto.ca (142.150.188.92)' can't be established.
ED25519 key fingerprint is SHA256:Hs195a31d1eE3s/HaBP4NC8n+dPdGDsPmOIpUi8lWys.
This key is not known by any other names.
Are you sure you want to continue connecting (yes/no/[fingerprint])? 

Make sure the fingerprints are correct! You should see either one of the ED25519 fingerprints:

ED25519 key fingerprint is SHA256:Hs195a31d1eE3s/HaBP4NC8n+dPdGDsPmOIpUi8lWys.
ED25519 key fingerprint is MD5:17:47:d0:5b:f5:be:de:0f:95:64:22:9c:31:95:ec:5e

or one of the following RSA fingerprints:

RSA key fingerprint is SHA256:xRWMLRfV5/5HLvE3aGWa09U8r+Gx7+YJz/tgTzOR7Nk.
RSA key fingerprint is MD5:50:5c:46:38:a9:93:df:1f:7a:71:3a:3e:20:45:26:19

depending on how old your ssh client is and how it is configured.

Alternative to prevent this question

Adding the following line to their ~/.ssh/known_hosts:

@cert-authority * ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAID1i4SKW0ys2/sZbZ2iKxUej5vPTl/v1fZYxWi8SGe/3 localhost SSH CA

will prevent the question from being asked when ssh-ing to the Teach cluster for the first time.