novaclient 命令nova list无法连接server端

[wangxuesonger]

我的openstack环境版本是queens
我自己建了一个heatvm，安装的novaclient版本如下
[root@host-192-168-1-18 log]# nova --version
10.1.0
以前这套环境自带一个heatvm，nova list是可以正常显示的
但是我在我自己的这个heatvm上，却报如下错误
[root@host-192-168-1-18 log] nova list
No handlers could be found for logger "keystoneauth.identity.generic.base"
ERROR (ConnectFailure): Unable to establish connection to https://10.112.249.5:13000/v3/auth/tokens: HTTPSConnectionPool(host='10.112.249.5', port=13000): Max retries exceeded with url: /v3/auth/tokens (Caused by ProxyError('Cannot connect to proxy.', NewConnectionError('<requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f97cfe005d0>: Failed to establish a new connection: [Errno 110] Connection timed out',)))
请问这能是什么原因导致的呢？多谢了