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I'm trying to set up password-less login with ssh on Ubuntu Server, but I keep getting:

Agent admitted failure to sign using the key

and prompt for password.

I have generated new rsa keys. Before the system reboot it worked just fine.

All the links lead me to this bug, but nothing works. SSH Agent is still not running.

How to fix that? Maybe the files need specific permissions?

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4 Answers 4

up vote 4 down vote accepted

This problem involves two machines. WHich was re-booted? ssh-add will only add the key on the client. If the key isn't accepted, there isn't a client error and a server error will only show up if the -v option is used when ssh is invoked on the client, to request the connection.

I suppose its possible too that Ubuntu the package has, for some unknown reason, altered the error message shown. It isn't an error issued by openSSH-server, as it is used in Debian (or anywhere else I've seen it, e.g. RHEL, CentOS, Knoppix, others).

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According to the Ubuntu Bugtracking you mentioned, this is a known bug in gnupg-agent it self. so upgrading to a new gnupg-agent version >2.0.14-1ubuntu1.7 solve the problem.

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My problem was resolved by executing export SSH_AUTH_SOCK=0, as explained in ssh Agent admitted failure to sign using the key on big endian machines on the Ubuntu bug tracker.

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That disables usage of the ssh-agent all together. – The problem is not in getting rid of it, but to use it! Btw: unsetting the variable has the same effect. –  Robert Siemer Dec 1 at 15:53

just run:

ssh-add

on the client (your pc)

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I like ssh-copy-id user@host.server.tld. –  Droogans Jun 29 '12 at 20:14
    
Isn't it lovely when you spend an hour banging your head against the wall & the answer turns out to be this simple –  connorbode Oct 28 '13 at 14:51
    
This should be the accepted answer! –  marlar Oct 24 at 7:44

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