SSH Key not found logging into CentOS 5.5 from Windows (Cygwin)

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http://serverfault.com – I am having difficulties logging in to a VPS running CentOS 5.5 using Public key authentication. I can log in to both a standard user account and the root account using password authentication. I am using Windows and Cygwin, all Cygwin and Windows stuff has been working completely fine for months; I am sure the issue is server side. I have used ssh-keygen to create both an id_rsa private key and an id_rsa.pub public key. I have copied this into the user directory on the server and done cat id_rsa.pub < authorized_keys. My /home/myuser/.ssh directory is set to 700, the authorized_keys file (HowTos)