System.DirectoryServices.DirectoryServicesCOMException: An operations error occurred

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I had exactly the same error and fixed it by changing the site’s application pool to run under the Network Service.

In IIS:

  • Select your site’s application pool
  • Select Advanced Settings on the right-hand side
  • On the Advanced Settings pop-up window, scroll down to the Process Model group
  • Change the first option called Identity to NetworkService (mine was set to the default ApplicationPoolIdentity).

I hope this helps.

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