Why does authentication fail when you log in to the web NMS for S series switches

The possible causes of authentication failures when you log in to the web NMS on an S series switch (except the S1700) are as follows:
1. The user name or password is incorrect.
Run the display local-user command to check whether the user exists.
Run the display local-user username user-name command to check whether the user password is correct.
2. There is no HTTP user access type.
Run the display local-user username user-name command to check whether the AuthMask field of the user contains H (HTTP login).
3. The user connected to the switch is full. The switch supports a maximum of five users.

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