Troubleshooting steps if a network device shows a configuration error or is discovered as unknown

Troubleshooting steps if a network device shows a configuration error or is discovered as unknown

A device shows a configuration error or is listed as unknown if:
  1. The Simple Network Management Protocol (SNMP) credential entered is incorrect.
  2. The device is not responding to SNMP requests.
  3. A device template is not associated.
Go to Network > Network Devices, and click the desired network device name. This will automatically take you to the Edit Network Device page if it's in a configuration error state. If not, click the hamburger icon next to the device name and select Edit.

If the entered credential is incorrect or empty (displays a hyphen), test the credential. If the test fails, associate a different credential. If the credential test fails even for the correct credential, create a new credential, and test it.


The association process takes a minimum of five minutes. If the configuration error persists even after associating a credential, you can test the SNMP credentials directly using the MIB Browser. The failure could be due to any of the following reasons: 
  1. The SNMP port is blocked
  2. There exist firewall blocking requests to that device 
  3. The device does not allow the poller installed machine's IP to access SNMP 
If using the MIB Browser also fails, you'll have to troubleshoot by checking for errors on your end with your system admin or device vendor.

If a device template is not associated (the category is shown unknown and/or device type is unknown), associate an existing default device template with the network device. In case you don't find a suitable template from the list of default templates or you want to create your own custom device template, add a device template, and then associate it.