An enterprise has newly deployed Huawei Cloud Stack for testing services. The enterprise IT engineer wants to use the CPS CLI command to view the current host status. After executing the command, the error "Connection refused" is returned. Which of the following descriptions of possible causes of the failure is wrong?

An enterprise has newly deployed Huawei Cloud Stack for testing services. The enterprise IT engineer wants to use the CPS CLI command to view the current host status. After executing the command, the error "Connection refused" is returned. Which of the following descriptions of possible causes of the failure is wrong?
A . Node operating system file is abnormal
B . The socket port of the host where the control node is located that provides CPS service is abnormal
C . Node network failure
D . When the authentication mode is turned on, the DNS configuration is wrong, resulting in the CPS command being unavailable.

Answer: D