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Home > Success Center > Network Performance Monitor (NPM) > Error: Interface State Unknown

Error: Interface State Unknown

Updated June 29, 2017


This article provides steps to resolve the following error:

Error: Interface State Unknown


All NPM versions


The issue is caused by interfaces reindexing after a reboot of the device.


Refer to the article below for a possible solution to this issue: 

What is interface index (ifindex) persistence? (© 2017 Cisco®, available at, obtained on May 11, 2017.)


  1. Open the Orion Web Console.
  2. Go Settings > Manage Nodes.
  3. Search and expand the node in question
  4. Identify the rogue interface.
  5. Select the checkbox and click Delete.
  6. Select More Actions > Rediscover.
  7. Select List Resources and select the target interface.


Disclaimer: Please note, any content posted herein is provided as a suggestion or recommendation to you for your internal use. This is not part of the SolarWinds software or documentation that you purchased from SolarWinds, and the information set forth herein may come from third parties. Your organization should internally review and assess to what extent, if any, such custom scripts or recommendations will be incorporated into your environment.  You elect to use third party content at your own risk, and you will be solely responsible for the incorporation of the same, if any.


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