Hi user!
Possible Causes
SNMP parameters are incorrect.
Procedure:
1. Log in to the server WebUI.
2. Check whether the SNMP parameters are correct.
Add a server using SNMPv1 or SNMPv2c.
The value of Port must be the same as the port number of the SNMP Agent service
The value of Read community must be the same as that of Read-Only Community.
The value of Write community must be the same as that of Read-Write Community.
Add a server using SNMPv3.
The value of Port must be the same as the port number of the SNMP Agent service
The value of Username must be the same as the user name for logging in to the server WebUI.
The value of Authentication protocol must be the same as that of SNMP V3 Authentication Protocol.
The value of Data encryption protocol must be the same as that of SNMP V3 Privacy Protocol
The value of Authentication password must be the same as that of Current User Password for user root and contains at least eight characters.
The value of Data encryption password must be the same as that of Current User Password for user root and contains at least eight characters.
Add the server again after modifying the SNMP parameters.
https://support.huawei.com/enterprise/en/doc/EDOC1000157217/7b76f0f0/faq-and-troubleshooting-typical-configuration-examples
Thanks!