I cannot log in to the AR router. How is this problem solved

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1. By default, a user cannot log in to the AR router. You need to run the authentication-mode command in the VTY view to set the authentication mode.
2. To obtain more operation rights, run the user privilege level command in the VTY view to set the user level.
3. To enable the system to disconnect a user from the VTY interface when the timeout period expires, run the idle-timeout command in the VTY view to set the timeout period.

Other related questions:
DHCP clients cannot obtain IP addresses. How do I solve this problem
Ensure that the DHCP configuration is correct, and reduce the IP address lease. If a long IP address lease is set, after all addresses in the address pool are allocated, addresses that are not required cannot be released immediately. As a result, other DHCP clients cannot obtain IP addresses.

An AR router cannot be logged in to remotely in web mode
The AR router cannot be logged in to remotely in web mode because the login needs to cross a public network. If carrier-side devices are configured to filter HTTP access requests meant for interface 80, the web login fails. Run the http server port command to modify the interface number, whose value is 80 or any value in the range from 1025 to 51200. By default, the interface number of an HTTP server is 80. You are advised to change the interface number to a large value, for example, 1025, and avoid the value 80. # Set the interface number of the HTTP server to 1025. [Huawei] http server port 1025

How to configure an AR router which cannot be logged in to over Telnet
If an AR router cannot be logged in to over Telnet, log in to the device over the Console interface for service configuration and configure Telnet. Alternatively, log in to the device by using the web NMS for service configuration and configure Telnet.

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