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I ran into a similar problem and followed the steps using the debug mode. /usr/sbin/sshd -d This showed the following result debug1: trying public key file /root/.ssh/authorized_keys debug1: fd 4 clearing O_NONBLOCK Authentication refused: bad ownership or modes for directory /root debug1: restore_uid: 0/0 debug1: temporarily_use_uid: 0/0 (e=0/0) debug1: ...


You may want to look at the answers to a similar question on the Superuser SE site, Can I re-attach SSH key forwarding through a disconnected Screen session. The answers are likely the same.


Your tmux session was started before your ssh agent was started, so the SSH_AUTH_SOCK and SSH_AGENT_PID variables are not set inside it. There are two ways to solve this. You can either copy those variables into the tmux session or run ssh-agent inside tmux to get them set, then run ssh-add to add the key to your ssh agent.


I would create a separate specific passwordless SSH key for this purpose. On the server side, you can set limits to what that key can be used for and where it can connect from, so that even if someone gets hold of the key, they would still not be able to use it to do something malicious. The way to limit the key is to edit the authorized_keys file on the ...


Take a look at the keychain package. I'm not sure if it will do what you want, but it does cache the keys in memory in some fashion. And it does not require X to work.


You can use SSH keys which have no passphrase. If you don't like that idea then you can create a key file without passphrase and put it into a RAM disk. Thus after a reboot you would have to log in manually in order to prepare the system for batch SSH usage by entering the passphrase and providing the new file. In the ssh calls you would have to provide ...


Not sure which client you are using, but for some the default settings is to forward SSH agent requests and to ignore the middle-man's key(s). Look in your documentation to disable "agent forwarding", in ssh(1) that is the -a option and the ForwardAgent configuration value.

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