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I tried to set up an authentication subkey with GPG for authentication against SSH servers, following this instruction set. Everything seems to work so far, but ssh-add -l does not show any keys:

$ ssh-add -l
The agent has no identities.

Also I cannot log in to servers where I put my public key.

What can I do to fix this?

1 Answer 1

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I found out that gpg-agent is picky about line endings in ~/.gnupg/sshcontrol. Specifically the line with the key ID needs to end with a newline, having the end of file there is not sufficient.

After adding a newline to the sshcontrol config file, ssh-add -l shows the key correctly.

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  • Is this the solution to your post? Just wondering since this sounds like a comment to me, and you don't mention if this make ssh-add -l show the wanted output but I don't mind if i were to be wrong here :) May 15, 2021 at 22:02
  • Thank you for your remark, @NordineLotfi, I amended the answer accordingly.
    – quazgar
    May 16, 2021 at 12:36
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    Having a newline at the end is what makes it a line (and, by extension, the file a text file) by definition.
    – muru
    May 16, 2021 at 12:45

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