Dear friend!
Before using SNMP, ensure that the PC where the uNIC is installed is directly connected to the device. Then, perform the following operations:
1. If the version is SNMPv2c, check whether the read and write community names are correct.
2. If the version is SNMPv3, check whether the user name and authentication password are correct.
If the preceding checks are passed, use the MIB Browser to connect to the device. If the connection fails, check whether the connection is restricted on the device.
Thanks!