Host key verification failed on first ssh connection

Question

I'm trying to log with ssh on my EC2 instance with a new dual-booted ubuntu 16.04. It's the first time i'm logging in with this client, so there is nothing in .ssh/known_hosts to be deleted, as it is suggested in many other posts like this one.

When I run :

ssh -i "my_key.pem" [email protected]

I get:

The authenticity of host 'servername.amazonaws.com (serverip)' can't be established.
ECDSA key fingerprint is SHA256:***************************.
Are you sure you want to continue connecting (yes/no)? 
Host key verification failed.

Since i can log with the exac same key from putty on my windows computer,and also from a mac with the same key, this doesnt seem to be key-related.

Anyone out there to help? Thanks in advance!

EDIT: i installed putty on linux, since it was working on windows. Doesnt work either.

nmap localhost gives me port 22 open. nmap my.ip doesnt.

I tried to ssh to another address, and same results on ssh and putty :(

EDIT2: not a duplicate of BitBucket: Host key authentication failed

Problem solved: it was just me who only pressed Enter on "Are you sure you want to continue connecting (yes/no)?" and not typing yes. Thanks @Kenster

At the "Are you sure you want to continue connecting (yes/no)?" prompt, what do you do? — Kenster
– Kenster, Commented May 17, 2017 at 13:54
I just pressed enter supposing it was yes on default. Now i feel dumb but at least my problem is solved, adding yes works. Thanks @Kenster you just solved my problem! — Apollinaire
– Apollinaire, Commented May 17, 2017 at 14:00
Possible duplicate of BitBucket: Host key authentication failed — Jakuje
– Jakuje, Commented May 17, 2017 at 14:10

J. Middya · Accepted Answer · 2020-01-22 06:25:47Z

3

If you do not get any option to continue to connect and it fails permanently, then you could use the command with StrictHostKeyChecking=no option like following :

ssh -i "my_key.pem" [email protected] -o StrictHostKeyChecking=no

answered Jan 22, 2020 at 6:25

J. Middya

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