Ubuntu 14.04 SSH bug for “Agent admitted failure to sign using the key”_ubuntu14 agent admitted failure to sign using the -优快云博客

本文介绍了一种常见问题：从Ubuntu桌面使用SSH密钥登录服务器失败。通过排查发现，gnome-keyring是导致此问题的原因之一。文章提供了一个简单的方法来验证这一故障，并给出了可能的解决方案。

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For the past few weeks I’ve had problems logging into servers using my SSH keys from Ubuntu desktops. The following would happen each time:

[chris@work ~] $ssh server Agent admitted failure to sign using the key. Permission denied (publickey). [chris@work ~]$
Oddly, this only happened from my Ubuntu desktop systems. My Ubuntu servers had no issue connecting.

After some digging, I found out that issues with the gnome-keyring were at fault. gnome-keyring doesn’t always handle specific formats of SSH keys correctly. Unfortunately, gnome-keyring was trying to handle all SSH key usage, preventing the keys from working.

If you are having this issue, you can confirm that gnome-keyring is at fault on your system by added SSH_AUTH_SOCK=0 in front of the ssh command as follows:

[chris@work ~]$ SSH_AUTH_SOCK=0 ssh server
Welcome to Ubuntu 14.10 (GNU/Linux 3.13.0-37-generic x86_64)

Documentation: https://help.ubuntu.com/

0 packages can be updated.
0 updates are security updates.

Last login: Wed Mar 11 11:49:50 2015 from host
[chris@work ~]$
If the connection works, then you likely have the same problem that I had. If the connection does not work, please read the Fixing other sources of agent failure section below for further ideas to fix your problem.