Cannot Connect via SSH to Ubuntu 22.04 Machines With Private Key

Description

Connecting to an Ubuntu 22.04 VM with a private key using the SSH direct access link may fail.

Solution

To resolve this issue:

1. Login to Ubuntu 22.04 machine.

2. Edit /etc/ssh/sshd_config.

3. Add the following line to the end of the config file:

   PubkeyAcceptedKeyTypes +ssh-rsa

4. Restart ssh server:

   systemctl restart ssh

Or run this command:

sudo echo -e "PubkeyAcceptedKeyTypes +ssh-rsa\nHostKeyAlgorithms +ssh-rsa" >> /etc/ssh/sshd_config&&systemctl restart ssh

To deploy an Ubuntu-22.04 AWS EC2 App:

1. Create the script with the below content and place it in an S3 bucket or make it accessible from the deployed App's VM.

   #!/bin/bash
   
   sudo echo -e "PubkeyAcceptedKeyTypes +ssh-rsa\nHostKeyAlgorithms +ssh-rsa" >> /etc/ssh/sshd_config&&systemctl restart ssh

2. In the App's Deployment Paths page, specify a link to the script in the USER DATA URL attribute.