I've spun up another appliance in a different VPC in a different region, with a different SSH key that I've already used on other EC2 instances, I've tried connecting directly from my mac and via a jumphost. When I try to connect:
$ ssh -i sshkey.pem root@xxx.xxx.xxx.xxx
The authenticity of host 'xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx)' can't be established.
RSA key fingerprint is xx:xx:xx:xx:xx:xx.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'xxx.xxx.xxx.xxx' (RSA) to the list of known hosts.
Connection closed by xxx.xxx.xxx.xxx
:o(
I must be doing something very very simple, very very wrong. Please enlighten me.
More verbose debug SSH info I can provide.