How to troubleshoot SNMP issues on NASN rectifiers?

SNMP is a standard network management protocol widely used on TCP/IP networks. It enables network management stations (NMSs) to monitor and manage network devices such as switches, routers, inverters and rectifiers.

There are certain situations when it stops working or it doesn't work as expected. If an NMS cannot use SNMP to manage the network device inverter or rectifier, SNMP interconnection between them fails. This is usually caused by an incorrect network or SNMP configuration. You can locate and rectify the fault according to the following procedure:

#1.Checking SNMP option on rectifier

SNMP service is not enabled by default.You need to enable it by the switch at the back panel.

#2Checking Network Connectivity

Network connectivity is the prerequisite for SNMP interconnection. You can run the ping command to check whether the NMS and rectifier can communicate with each other. If not, verify the route configuration on the inverter/converter, intermediate network, and NMS to ensure that the switch and NMS can ping each other.

#3.Checking Whether Duplicate SNMP Engine IDs Exist on the Network

Duplicate SNMP engine IDs usually occur when the configuration file of a switch is copied and modified as the configuration file of another switch, but the SNMP engine ID is not modified. If this problem occurs, run the undo snmp-agent local-engineid command on the switch to restore the default SNMP engine ID.

#4.Checking whether SNMP is blocked.

You can open Windows Firewall Advanced Settings and check if there are any rules blocking SNMP. The newest version of Windows and Windows Server, it is called Windows Defender Firewall with Advanced Security.

SNMP service is enabled, but I still can’t monitor target Windows machines using SNMP. Well, check the next step(s).

#5Checking SNMP settings

It is not only enough to enable SNMP on your Windows, you also need to configure it. It could happen that settings are not matched, and Windows and NMS can’t exchange SNMP messages. It could also happen that someone intentionally and accidentally made some changes. So, it always makes sense to check if the settings are matched or not.

#6 SNMP stopped working after Windows Update

Well, this might happen with any Windows features. Windows Update is a must to do, but sometimes it just breaks things. We as IT professionals need to have a mechanism for how to mitigate or minimize potential problems.

If you noticed that SNMP stopped working after Windows Update, you can try to revert the update to the previous version (if possible). If you can’t do it, search for potential fixes on the Internet.