![]() ![]() Public key authentication is a method of securely authenticating a user to a remote computer using a pair of cryptographic keys. What is SSH public key authentication in Linux In this article, we will dive into this issue and see how to troubleshoot it. Alternatively, incorrect permissions settings on the authorized_keys file or ~/.ssh directory could also be the cause of the issue. One possible reason for this error is that the key hasn’t been added to the authorized_keys file on the server. This is because the server is not able to recognize the key. I have a raspberry pi, with authentication off, and a ssh key with passphrase.When you receive the error message “SSH Permission denied (publickey)”, it means that there is a problem with the authentication process using a public key. I understand that simply copying these files to a new computer would not be very secure if this worked, but if my raspberry was not a physical device, but instead a cloud server, would I not be able to connect anymore? Everything would be lost? Can't I recover my access using the old keys and the passphrase? What is the good practice here? Always have a login authentication? The computer where I generated the ssh key doesn't work anymore, but I have backups of the id_rsa and id_rsa.pub files. To be more detailed about the steps I took and the error I'm getting, what I did was generation the keys on my old MacBook, and saved a backup of the d_rsa and id_rsa.pub files. I now have a new MacBook, where I copied the files to the. ![]() Solution 9 :- Try removing your host entry from 'knownhosts' file. When I try to connect to my raspberry pi, running Debian, I get the following WARNING: UNPROTECTED PRIVATE KEY FILE! 0644 for '/Users/caetano/.ssh/id_rsa' are too open. ![]() Sometime, there may be issue due to old or incorrect host key. Delete that particular host from knowhosts file using editor or command as follows. ssh-keygen -R hostname or vim /.ssh/knownhosts. Load key "/Users/caetano/.ssh/id_rsa": bad permissions It is required that your private key files are NOT accessible by others. You say "I understand that simply copying these files to a new computer would not be very secure" - I don't know where you got this idea. My keys have been installed on my 9 Pi and all the other computers I use on my local network for ssh & ftp access You can (and should) copy the public key to ~/.ssh/authorized_keys on any computer you trust. You should copy the private key to any of your computers you want to connect from. There is nothing to stop you having multiple private keys - I have several for different purposes, but use the same key on all my Pi. The error message has the fix - key files should only be readable by the user i.e. Rw permission for user caetano and read access for public keys but no access by others. If the keys are installed by the normal process ssh-copy-id this would be performed. cat /.ssh/idrsa.pub or sudo apt-get install xclip xclip -sel clip < /.ssh/idrsa.pub Copy/Install local public key to remote server ssh-copy-id USERNAMESERVERIP or ssh-copy-id -i KEYFILENAME ln-userSERVERIP NOTE: ssh-copy-id ssh-copy-id installs an SSH key on a server as an authorized key. ![]() Your local machine has too many keys Lets run through the troubleshooting process to determine whats creating your ssh permission denied error and solve the root cause: Run ssh -vvv for more info You can save a lot of time by determining why you cant connect before you proceed. You will need to set the permissions manually. #SSH COPY ID PERMISSION DENIED INSTALL#. ![]()
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