# ssh -p 2222 cas.run help
The authenticity of host '[cas.run]:2222 ([139.180.180.214]:2222)' can't be established.
RSA key fingerprint is SHA256:i5txciMMbXu2fbB4w/vnElNSpasFcPP9fBp52+Avdbg.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '[cas.run]:2222' (RSA) to the list of known hosts.
abucci@cas.run: Permission denied (publickey).