Why does the system display a message indicating that there is no right when you configure user-interface vty or user-interface console

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Users on the console port are at level 15. Only the user at level 15 can access the user console interface. Users on the VTY user interface at level 0. If the user level is upgraded to level 15 using the following command, the system displays a message indicating that the user level is too low.
user-interface vty 0 4
authentication-mode aaa
user privilege level 15
protocol inbound ssh

Example:
[huawei]user-interface vty 0 4
Error: The user level is too low.

Other related questions:
Why a message is displayed indicating that you are not authorized when you configure the VTY user interface and user console interface
The default user level of the user console interface is 15. Only the user at level 15 can access the user console interface. The default user level of the VTY user interface is 0. If the user level is upgraded to level 15 using the following command, the system displays a message indicating that the user level is too low. User-interface vty 0 4 authentication-mode aaa user privilege level 15 protocol inbound ssh Symptom: [huawei]user-interface vty 0 4 Error: The user level is too low.

How many VTY user interfaces does a switch support
By default, a switch allows a maximum of five VTY users at a time. You can set the maximum number of VTY users allowed using the user-interface maximum-vty command. This maximum number can be set to 15 at most (a maximum of 15 VTY users allowed). When the maximum number of VTY user interfaces is set to 0, no user (even NMS user) can log in to the switch.

The system displays a message indicating that the MU is offline when an user views live video
The MU stops running. Go to the following steps to restart the MU. Step 1 Log in to the OMU Portal of the master NE server. Step 2 Choose System Management > Business operation and management. Step 3 Click the MPU in the System Domains panel on the left, check whether the status of the MU is running. 1. If the Status of the MU is Running, contact Huawei engineers. 2. If the Status of the MU is Offline, go to the next step. Step 4 In the List of modules area, click the Restart corresponding to the MU. The system starts to restart the MU.

Why does the system display a message indicating that the name of a user's security certificate is invalid or is not aligned with the website name when the user logs in to the SSL VPN gateway
When the local certificate for the SSL VPN gateway is made, the CN field value of the local certificate must be the same as the IP address or domain name of the SSL VPN gateway. If they are different, the system displays a message indicating the name of a user's security certificate is invalid or is not aligned with the site name. NOTE: If the CN field value is the IP address of the SSL VPN gateway, the system also displays the above-mentioned message when users are logging in to the SSL VPN gateway using the domain name. Similarly, if the value for the CN field is the domain name of the SSL VPN gateway, the system also displays the above-mentioned message when users are logging in to the SSL VPN gateway using the IP address.

The lock icon is displayed in the lower right corner of the TE endpoint user interface in a conference.
The lock icon is displayed in the lower right corner of the TE endpoint user interface in a conference. 1. The lock icon indicates that this is an encrypted conference. You can set the encryption mode under System Settings > Security > Encryption on the web interface. 2. The encryption mode of the endpoint must be the same as the conference; otherwise, the endpoint cannot join the conference.

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