The Paris Cisco firewall monitor in PRTG was originally created with 86 different sensors. 17 of those sensors are RED, many with the message that “No such instance (SNMP error # 223)
Is there a fix to the "no such instance" error message? Below is a description of the issue
Modified on 2025-06-10 21:50:02 +0200
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The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.
The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.
Hi jmorant0,
No Such Instance error message most likely occur if the index of the OID changed. If these sensors point to an interface of your Cisco device, you can set the SNMP IFindex Persistence by following this guide. This will prevent similar issues in the future.
Please try to manually recreate the sensors where this error message is displayed, the new sensors will automatically point to the new Index and should start to work.
Best regards, Felix
Dec, 2016 - Permalink