AWS ec2 instance no supported authentication methods available server sent publickey gssapi-keyex gssapi-with-mic

Question

Created EC2 instance in AWS and trying to connect from putty. But getting error like, "No Supported authentication methods available(server sent: publickey)".

Even I tried several times to create new instances and downloaded new key value pair to change .pem to .ppk through puttyGen, And .ppk load into putty with providing proper public DNS name. But couldn't help out.

Please provide suggestions, how to connect from putty to ec2 linux instance.

Have a look at this thread, same issue discussed: https://www.edureka.co/community/30960/access-ec2-instance-using-putty — Kalgi, Aug 1, 2019
Followed above URL, But It seems different error as attached screen. I have done several times with generating .ppk file from .pem file through puttyGen. Please suggest the same. — Aug 2, 2019
https://www.edureka.co/community/30960/access-ec2-instance-using-putty is not useful, Because I followed same steps what they mentioned. But still getting below attached error. — vijay, Aug 2, 2019
Are you trying to login as a non-root user? That might be the issue. — Kalgi, Aug 2, 2019

MD · Answer 1 · Jun 20, 2020

same error I got

answered Jun 20, 2020 by Yunus

Try to use the username as given by AWS. For amazon AMI you have to use ec2-user as your username.

commented Jun 21, 2020 by MD
• 95,460 points

You just saved my life. THANK YOU!!

commented Oct 28, 2020 by Mira

Thanks bro!

You saved my life too!

hahaha

commented Aug 28, 2021 by ambrosiora

edited Mar 6

Thank You!!! It worked for me.

commented Sep 30, 2021 by Annn

edited Mar 6

score 0 · Answer 2 · Sep 16, 2021

I had the same issue, there could be that when you used Putty KeyGen to convert from PEM to PPK you used the default settings which uses version 3 which is not compatible with AWS EC2. You can set PPK Version 2 by default for PuTTYgen selecting in the app menu:

Key->Parameters for saving key files...->PPK file version: 2.