Switches: Resolving Faulted LACP Negotiation



This article explains how to resolve the Faulted LACP negotiation error when trying to configure NIC Teaming (LACP) between a Datto Switch and Windows Server 2012 R2.


By default, Datto switches are set to slow time-out. LACP requires the server and switch to have the same time-out setting. If the settings do not match, you will see a Faulted LACP negotiation error in the Windows NIC Teaming interface.


Although Datto can recommend changes to the Windows registry, always confirm with a Microsoft expert that the recommended changes are compatible with your environment before making any changes.

Microsoft has published this article with a hotfix that allows you to enable slow time-out on the server. 

This has been known to work when the following variables match:

  • Teaming mode: LACP
  • Load balancing mode: Dynamic

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