AWS SSH and SFTP Disconnected: No supported authentication methods available (server sent: publickey)

Disconnected: No supported authentication methods available (server sent: publickey)

Could not connect to server

Step 1 : Login aws console

Step 2 : Go to instance list

Step 3 : Stop instance which have issue

Step 4 : After stop instance, Click and open "View/Change User Data" (See image)

Step 5 : Add Following code into textarea

 Content-Type: multipart/mixed; boundary="//"
MIME-Version: 1.0
--//
Content-Type: text/cloud-config; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="cloud-config.txt"
#cloud-config
cloud_final_modules:
- [scripts-user, always]
--//
Content-Type: text/x-shellscript; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="userdata.txt"
#!/bin/bash
ls -Al
ls -Al /home
ls -Al /home/ubuntu
ls -Al /home/ubuntu/.ssh
sudo cat /home/ubuntu/.ssh/authorized_keys
chown root:root /home
chmod 755 /home
chown ubuntu:ubuntu /home/ubuntu -R
chmod 700 /home/ubuntu
chmod 700 /home/ubuntu/.ssh
chmod 600 /home/ubuntu/.ssh/authorized_keys
ls -Al
ls -Al /home
ls -Al /home/ubuntu
ls -Al /home/ubuntu/.ssh
sudo cat /home/ubuntu/.ssh/authorized_keys
sudo ufw disable
sudo service sshd restart
--//

Step 6 : Click on save button

 Step 7 : Finish! Check your SSH and SFTP detail