Adding a host to a distributed vSwitch fails with the error: Cannot complete operation due to concurrent modification by another operation

Products

• VMware vCenter Server
• VMware vSphere ESXi

Issue/Introduction

Symptoms:

• Cannot add a host to a distributed vSwitch
• Adding a host to a distributed vSwitch fails
• You see the error:
  
  Cannot complete operation due to concurrent modification by another operation

Environment

VMware vCenter Server 6.5.x

Cause

This issue occurs if your user account does not have full datacenter administrator permissions in vCenter Server.

Resolution

To resolve this issue:

1. Log in with a user account that has full administrative permissions in vCenter Server.
2. Restart the VMware VirtualCenter Server service on the vCenter Server machine.

Additional Information

How to stop, start, or restart vCenter Server services