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I have Putty running on Windows 7 64-bit, and am able to login using my local key/passphrase to a jump server, but from there I am not able to login to the other servers. While this is working from a OSX machine.

When debugging the SSH connection from both Windows and OSX I found the following difference:

OSX:

debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /Users/kmorris/.ssh/id_rsa (0x7fcc78b56880)
debug2: key: /home/ops/.ssh/id_rsa ((nil))
debug2: key: /home/ops/.ssh/id_dsa (0x7fcc78b51d30)
debug2: key: /home/ops/.ssh/id_ecdsa ((nil))

Windows:

debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/ops/.ssh/id_rsa ((nil))
debug2: key: /home/ops/.ssh/id_dsa (0x7fcc78b51d30)
debug2: key: /home/ops/.ssh/id_ecdsa ((nil))

One line missing, which is the key that is needed for the authentication. It simply looks like Putty is not forwarding my SSH key, but I enabled Agent Forwarding.

I'm out of ideas...

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I assume you have Pageant running and you actually authenticated to the jump server using it? –  Martin Prikryl May 5 '13 at 17:29
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