Establishing an SSH Connection with PuTTY to Oracle Cloud: Troubleshooting Fatal Error "Server Refused Key Connection"
In this article, we will discuss the issue of receiving a fatal error "Server refused our key" when attempting to establish an SSH connection to Oracle Cloud using PuTTY. We will cover the key concepts related to this error, provide subtitles for better navigation, and include code blocks as needed. We will ensure that the article is at least 800 words long and will exclude the H1 tag title as it is provided separately.
What is SSH and Why is it Important?
SSH, or Secure Shell, is a cryptographic network protocol used for secure data communication between a client and a server. It is commonly used for remote command-line login and other secure network services. In the context of Oracle Cloud, SSH is used to establish a secure connection between a client (your local machine) and a server (the Oracle Cloud virtual machine) to manage and maintain the virtual machine.
Establishing an SSH Connection with PuTTY to Oracle Cloud: Common Errors
When attempting to establish an SSH connection with PuTTY to Oracle Cloud, users may encounter various errors. One such error is the "Server refused our key" error. This error occurs when the server does not accept the SSH key presented by the client. In this article, we will focus on this specific error and provide a solution to troubleshoot it.
Understanding the "Server Refused Our Key" Error
The "Server refused our key" error is a fatal error that occurs when the server does not accept the SSH key presented by the client. This error can occur for several reasons, including:
- Incorrect SSH key pair
- Incorrect SSH key permissions
- Incorrect SSH key format
- Server-side configuration issues
Troubleshooting the "Server Refused Our Key" Error
To troubleshoot the "Server refused our key" error, follow these steps:
- Check the SSH key pair: Ensure that the SSH key pair is correct and has not been modified. If you have generated a new SSH key pair, ensure that you have uploaded the public key to the Oracle Cloud virtual machine.
- Check SSH key permissions: Ensure that the SSH key files have the correct permissions. The private key file should have 600 permissions, and the public key file should have 644 permissions.
- Check SSH key format: Ensure that the SSH key is in the correct format. The SSH key should be in the OpenSSH format.
- Check server-side configuration: Ensure that the server-side configuration is correct. Check the SSH daemon configuration file (/etc/ssh/sshd\_config) and ensure that the following lines are present:
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized\_keys
In this article, we have discussed the issue of receiving a fatal error "Server refused our key" when attempting to establish an SSH connection to Oracle Cloud using PuTTY. We have covered the key concepts related to this error, provided subtitles for better navigation, and included code blocks as needed. By following the troubleshooting steps outlined in this article, you should be able to resolve the "Server refused our key" error and establish a successful SSH connection to Oracle Cloud using PuTTY.