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Nigel Wash avatar Ubuntu

OpenSSH permission denied (public key)

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Nigel Wash

I am currently trying to configure an ssh server that uses key-based authentication instead of a password login. I am required to disable the following: AllowTCPForwarding, GatewayPorts, PermitRootLogin, HostbasedAuthentication, PermitEmptyPasswords, and X11Forwarding.

I have followed many tutorials on how to do this, however, when I try to log on to the SSH server I am greeted with

Permission denied (publickey).

I have already created the key using ssh-keygen -t rsa -b 4096 and copied it to ~/.ssh/authorized_keys on the SSH server, as well as enabled PubKeyAuthentication and restarted the server.

Any help would be greatly appreciated!

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ssh
uz flag
Jos
Use `ssh` with multiple `-v` flags to get a (very) verbose description of what is happening between client and server. At the very least, this will give you the relevant error message.
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shaggyrogers avatar Ubuntu
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shaggyrogers

You need to specify on the client side which key to use.

You can do this either with ssh -i PATH_TO_PRIVATE_KEY, or via a configuration file, the latter being much more convenient.

Here's an excerpt from my ~/.ssh/config which applies to github:

Host github github.com
    HostName github.com
    User git
    PasswordAuthentication no
    IdentityFile ~/.ssh/github.shaggyrogers.rsa

Note that words immediately following Host are the hostnames (as entered on the command line) that the configuration block applies to. In this case, I can simply type ssh github or ssh github.com. See man ssh_config for more information.

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