What AWS instance setting can prevent to perform ssh to this instance? : I supposed to add the ssh key and then ssh to the AWS instance using a jumphost in 2 operations
So adding the key

    ssh-add ~/.ssh/<key-file>.pem

Then ssh to jumphost
  
    ssh -A ec2-user@jumphost

And then from jumphost to instance

    ssh -A ec2-user@<private IP>

This works for one instance but does not work for another instance - cannot ssh to this instance from a jumphost.

What instance setting can prevent me  to do ssh?

