Why a message is displayed indicating that you are not authorized when you configure the VTY user interface and user console interface

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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.

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

FAQs about OceanStor Toolkit
Refer to Revelations of Troublesolving cases on the right.

Description of the console cable
A console cable connects the console interface of an AR to the serial interface of a PC. The cable connects to the AR through the RJ45 connector and connects to the PC through the DB9 connector.

Description of user levels on AR routers
User levels on AR routers are as follows: You can configure different user levels to control access rights of different users and improve device security. There are 16 user levels numbered from 0 to 15, in ascending order of priority. Visit level-0: It is used for network diagnosis, access to the external device, such as ping, tracert, and Telnet. Monitoring level-1: It is used for system maintenance, including display commands and other commands. Some display commands are unavailable at this level. For example, the display current-configuration and display saved-configuration commands are level-3 management commands. Configuration level-2: Service configuration commands. Management level-3 to 15: They are used to control basic system operations, including system file, FTP/TFTP download, user management, command level setting, and debugging commands. User levels correspond to the command levels. Users can use only the commands at the same or lower level than their own levels. By default, users logging in from the console port can run level 15 commands. By default, the user level of other login modes is 0 (visit level), that is, after the user logs in to a device, the user can only run the commands at level 0, including ping, tracert, and other commands for network diagnosis.

Why no information is displayed on the console interface of an AR
The possible causes are as follows: - Parameter settings on the console interface are incorrect. - The console cable is faulty. - The path of startup files is incorrectly specified. - The storage device (SD card or USB flash drive) saving the startup files has been removed from the AR or is not securely connected to the AR. - The memory card is loosely connected.

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