Handler CoveoSearchEndpoint has a bad module ManagedPipelineHandler in its module list

Description

Your Coveo-powered search page in Sitecore doesn’t load and/or returns a 500 error.

Browsing the Rest Proxy ([sitecore instance]/coveo/rest), you see the following error:

Handler "CoveoSearchEndpoint" has a bad module "ManagedPipelineHandler" in its module list.

Explanation

The Sitecore instance running in Classic Pipeline mode can’t load the Coveo components properly. An integrated pipeline mode is needed.

Resolution

  1. Open IIS Manager and look at the advanced settings for the app pool the Sitecore site is associated with.

  2. Change the Managed Pipeline mode to Integrated.

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