[ubuntu] LTSP - login fails - no response from server

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http://ubuntuforums.org – I've just built my first LTSP, and have pxe booted my first client, I receive the login screen, but after putting in my user and password I get "ltsp login no response from server restarting" and I'm presented again with the login portal. What I've done: I've enabled password authentication in the ssh config. I've tested the login account via SSH and can successfully login to the server via a putty session. I've run the following commands on the server: sudo ltsp-update-sshkeys sudo ltsp-update-image However the issue continues. Does anyone have any pointers, I've sea (Hardware)