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I have a key-pair generated with Kleopatra (from Gpg4win 3.0 suite). I've converted the public key to an RSA ssh key and add it to the authorized_keys file in a Linux box.

On the Windows machine I've configured the gpg-agent.conf file as:

enable-putty-support
debug-level guru
log-file C:/Users/myusername/log.txt
disable-scdaemon

However, when I open PuTTY and try to connect to the server, I've got the error:

"Disconnected: No supported authentication methods available (server sent: publickey)"

The question is: how can I use Putty from the Windows machine to connect to the Linux machine through SSH using the gpg key pair? I understood that gpg-agent impersonates Pageantagent so it should use the gpg private key on memory to serve encrypted strings to PuTTY. Is this right? or Am I misunderstanding everything here?.

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    Is the key whitelisted as a SSH key in gpg-agent (.gnupg/sshcontrol)?
    – grawity_u1686
    Commented Apr 25, 2018 at 13:40

2 Answers 2

Reset to default
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If anyone has the issue: complete working procedure at https://gist.github.com/matusnovak/302c7b003043849337f94518a71df777

As @user1686 said, it seems the only required step the OP hasn't done is to add the keygrip in the sshcontrol file.

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For me, the procedure that worked to integrate gpg with Putty is here

Looking at OP, it seems that is missing the restart of the agent after creating/modifying the gpg-agent.conf file:

gpg-connect-agent KILLAGENT /bye
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