Wordpress can't find ssh public and private key pair

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http://serverfault.com – My server configuration is as follows: CentOS 5.8 (final) running Nginx. I am using the SSH2 feature of Wordpress's plugin installer. I have installed lib2ssh and it is working (Wordpress is acknowledging it exists). The user (called playwithbits) I supplied to wordpress is chrooted and has the home directory of /home/nginx/domains/playwithbits/ The public and private keys are located in the directory /home/nginx/domains/playwithbits/keys/ and are named id_rsa.pub and id_rsa respectively. I have copied the contents of id_rsa.pub to the file authorized_keys located in /home/nginx/domains (HowTos)