You are connecting to an OpenSSH server using an RSA private key and the following error is displayed:
USERNAME@HOST: Permission denied (publickey,password).
You check the OpenSSH server logs and find the following entry:
userauth_pubkey: signature algorithm ssh-rsa not in PubkeyAcceptedAlgorithms [preauth]
You are not able to authenticate with the SSH… Continue Reading →
Introduction Ubuntu 20.04 Desktop does not include an SSH server preinstalled. In this article, I show how I install OpenSSH, create an SSH keypair, install the keypair Ubuntu for a user and disable password-based SSH logins. I also include a… Continue Reading →
Introduction You have a Ubuntu instance running in an Azure Virtual Machine. You connect to this instance via SSH. One day you decide to enable the UFW firewall and your SSH connection drops. You cannot reconnect. Problem Enabling the UFW… Continue Reading →
Table of Contents Introduction Definitions Example Private & Public Keys OpenSSH Public Keys SSH-2 Public Keys Examining OpenSSH Public Keys Introduction There is a lot of confusion and inaccurate information on the Internet about Key Pairs and Private/Public keys. This… Continue Reading →