I have two servers, with a common home directory, and therefore common
~/.ssh directories. I add my private key to the agent on my desktop.
In this way, I can
ssh -A from
desktop -> machine1a then to
target machine passwordlessly. So far so good. Now I put another "machine-in-the-middle" in. I can so
ssh -A from
desktop -> machine1b then to
target machine. However, on this last hop, SSH asks for the passphrase to my private key file. This is my problem.
I have tried setting "AllowAgentForwarding yes" in machine1b's /etc/ssh/sshd_config, but the man page states that the default is yes anyway.
I can see the following in the output of "ssh -vvv" on machine1a and machine1b:
debug1: Requesting authentication agent forwarding. debug2: channel 0: request firstname.lastname@example.org confirm 0
The machines are identical OS's, and as I mentioned, the home directories are NFS-mounted on each machine so they too are identical. The permissions etc. of the .ssh directories and the files within seem to be OK - there are no error messages in the logs of the machine being logged into.
The last bit of output from machine1b when I do "ssh -vvv" is this:
debug1: PEM_read_PrivateKey failed debug1: read PEM private key done: type <unknown>
It feels like something wrong with sshd on machine1b, but I can't find anything.
Does anybody have any other ideas?