If you forget the web login password, log in to the switch through the console port, Telnet, or STelnet, and set a new password for web login.

NOTICE:

Telnet may bring security risks. You are advised to log in to the switch through the console port or STelnet.

# Set the user name and password to admin123 and Huawei@123 respectively.

<HUAWEI> system-view
[HUAWEI] aaa
[HUAWEI-aaa] local-user admin123 password irreversible-cipher Huawei@123
[HUAWEI-aaa] local-user admin123 service-type http
[HUAWEI-aaa] local-user admin123 privilege level 15
[HUAWEI-aaa] return
<HUAWEI> save

More Information: S Series Switches Common Operation Guide