How to resolve 'Permission denied (publickey)' or 'Authentication failed, permission denied' errors when accessing the EC2 instance?

1 Answers

Here are some methods you can try to resolve the 'Permission denied (publickey)' or 'Authentication failed, permission denied' errors

Verify the User Name: Ensure that you’re using the correct user name for your AMI.
Check File Permissions: Verify that the file permissions within the operating system are correct and that the correct SSH public key is in the authorized_keys file.
Enter Key File Password: Enter the password for your key file or use ssh-agent to load the key automatically.
Check Instance’s Permissions: Check that the instance’s permissions are correct and the correct SSH public key is in the authorized_keys file.

If you copied your SSH keys from another source, you might encounter a permission denied error. This can happen if the file permissions on the SSH keys are too open. It’s simply not allowed to have 777 permissions on the public or private keys. You can set the following permissions on the ssh directory and its files:


.ssh directory: 700 (drwx------)

public keys: 644 (-rw-r--r--)

private keys: 600 (-rw-------)

authorized_keys: 600 (-rw-------)

known_hosts: 600 (-rw-------)

config: 600 (-rw-------)

You can change these permissions using chmod command.

If these methods don’t work, you might need to check your SSH configuration file or restart your SSH service.

Tushar Pandey
Sep 20, 2023

2 0

Write Answer Ask Question

Can you launch Amazon Elastic Compute Cloud (EC2) instances with predetermined private IP addresses? If yes, then with which Amazon service is possible?

Bharat bhushan
Nov 18, 2023

Yes, you can launch EC2 instances with predetermined private IP addresses using Amazon Virtual Private Cloud (VPC).

tushar vadhavana
Nov 18, 2023

0 0

Compare Related Software

Amazon EC2 VS Google Compute Engine

Amazon EC2 VS Utho

Amazon EC2 VS RapidScale

How do I troubleshoot issues when I install or update SSM Agent on my Amazon EC2 Windows instance?

Nandini
Sep 19, 2023

To troubleshoot issues when installing or updating SSM agent on amazon EC2 windows instance, follow the steps given below:

Check the EC2 instance's IAM role permissions for SSM.
Make sure that your instance has internet connectivity.
Review CloudWatch Logs for SSM Agent error messages.
Verify that the SSM Agent version is compatible with your EC2 instance's OS.

Nilankur Das
Feb 29, 2024

0 0

Why can’t I update Windows on my Amazon EC2 Windows instance?

SHUBHAM SINGH
Sep 19, 2023

You may encounter difficulties updating Windows on your Amazon EC2 Windows instance due to potential connectivity issues preventing access to the Microsoft KMS server, leading to Windows activation errors. You can troubleshoot network and firewall configurations to resolve this problem.

Naween kumar Jha
Mar 01, 2024

1 0

How can I use the AWSSupport-ManageRDPSettings runbook to manage the RDP settings on my Amazon EC2 Windows instance?

Harsh Mahajan
Sep 19, 2023

The AWSSupport-TroubleshootRDP runbook enables the user to make changes in the common settings on the targeted instance which might impact Remote Desktop Protocol (RDP), for instance, the RDP port, NLA and Windows Firewall profiles. It is optional that the changes can be done offline by stopping and initiating the instance if the user specifically enables offline remediation. Then the runbook is able to read and provide the utility of the settings.