AWS EC2 Connection closed by when trying ssh into instance

Question

Recently I set up a new EC2 instance. The next day I was not able to connect to my instance via ssh. I could connect and disconnect the day before, I am sure I did nothing.

Answer 1

(1) Please check when you execute the ssh command, are you in the same folder where you put your pem key. Else you should use "ssh -i /your_key_path /mykey.pem".

(2) If that doesn't help. I think you could create another key and set your EC2 instance through AWS webpage. Then try again.