when i add new plugin, theme 

after entering the ftp details 

redirected 

Not Acceptable

An appropriate representation of the requested resource /admin/plugins/ftp-attrs/ could not be found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Apache/2.2.19 (Unix) mod_ssl/2.2.19 OpenSSL/0.9.8e-fips-rhel5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at www.mithilaface.com Port 80