Error massage like "Error getting VMkernel NIC for portgroup ..." appears in the command line output in ESXi.

Products

• VMware vSphere ESXi

Issue/Introduction

• When running commands in ESXi, such as "esxcli network ip interface list" and "esxcfg-vmknic -l", the command line outputs contain like following error messages.
  Error getting VMkernel NIC for portgroup <Portgroup Name> Error was:Unable to find vmknic for portgroup: <Portgroup Name> netstackInstance: defaultTcpipStack at config location /net/vmkernelnic/child
• The previously existing VMkernel adapter (vmkX) may disappear from the GUI.
• When ESXi is restarted in this state, the VMkernel adapter disappears from ESXi.

Environment

VMware vSphere ESXi

Cause

This happens if you previously attempted to add an VMkernel adapter with the same name as an existing one using "esxcli network ip interface add" command. In other words, this occurs after "esxcli network ip interface add" command fails with an "Already exists" error. The issue is believed to be due to an inadequate error handling in esxcli command.

Resolution

Restart ESXi, and if the VMkernel adapter is missing, recreate the new one with the same settings.