OpenStack コマンドを入力すると The request you have made requires authentication. エラーが発生する

Issue

• ERROR (Unauthorized): The request you have made requires authentication. (HTTP 401) エラーが発生します。

[root@localhost ~(keystone_admin)]# nova list
ERROR (Unauthorized):The request you have made requires authentication.(HTTP 401) (Request-ID: req-6552e53f-168c-415e-8fc6-27b28a12739a)

[root@localhost ~(keystone_admin)]# grep -r "6552e53f-168c-415e-8fc6-27b28a12739" /var/log/
/var/log/keystone/keystone.log:2016-05-10 14:38:30.881 99332 INFO keystone.common.wsgi [req-6552e53f-168c-415e-8fc6-27b28a12739a - - - - -] POST http://172.23.89.44:5000/v2.0/tokens
/var/log/keystone/keystone.log:2016-05-10 14:38:30.896 99332 WARNING keystone.common.wsgi [req-6552e53f-168c-415e-8fc6-27b28a12739a - - - - -] Authorization failed.The request you have made requires authentication. from 172.23.89.44
/var/log/httpd/keystone_wsgi_main_error.log:[Tue May 10 14:38:30.882095 2016] [:error] [pid 99332] 2016-05-10 14:38:30.881 99332 INFO keystone.common.wsgi [req-6552e53f-168c-415e-8fc6-27b28a12739a - - - - -] POST http://172.23.89.44:5000/v2.0/tokens
/var/log/httpd/keystone_wsgi_main_error.log:[Tue May 10 14:38:30.897398 2016] [:error] [pid 99332] 2016-05-10 14:38:30.896 99332 WARNING keystone.common.wsgi [req-6552e53f-168c-415e-8fc6-27b28a12739a - - - - -] Authorization failed.The request you have made requires authentication. from 172.23.89.44