Error : No supported authentication methods available on AWS

Question

• SSH for my AWS server is not working for Filezilla and Putty.

 Error:

Disconnected : No supported authentication methods available 

• The error is similar like setting up AWS SSH for the first time

1. Incorrect .ppk file
2. Wrong username
3. Wrong IP

Are there any other possibilities?

• The solution is that all the above problems should have permissions.

Here's an example:

/folder/ec2-user/ - 700

/folder/ec2-user/ .ssh/ - 0600

/folder/ec2-user/ .ssh/authorized_keys - 

Answer 1

• This error can occur immediately after changing the user’s home directory by:

Command: sudo usermod -d var/www/html username

• For e.g: I have recreated the instances to use Amazon Linux instead of Ubuntu.

Now, I have to switch to use "EC2- user" as the username instead of "Unbuntu" to make sure that any error is not occurring.

• It can also occur due to lack of permission to the authorized_key file in ~/.ssh

The permission of this file should be 0600 and permission of ~/.ssh should be 700.

Answer 2

Your problem can be compared to incorrect login which varies depending on AMIs. Use the following logins on following AMIs:

• ubuntu or root on ubuntu AMIs
• ec2-user in Amazon Linux AMI
• centos on Centos AMI
• Debian or root on Debian AMIs
• ec2-user or fedora on Fedora
• ec2-user or root on RHEL AMI, SUSE AMI.

If you are using OS:

1. Windows - get PEM key from the AWS website and generate a PPK file using PuttyGen. Then you have to use Putty to use the PPK (select it using left-column: Connection->SSH->Auth: Private key for authorization)
2. Linux - run: ssh -i your-ssh-key.pem login@IP-or-DNS

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