Applies To
Exchange Server 2019 Exchange Server 2016

Symptoms 

Consider the following scenario:

  • An administrator initiates an eDiscovery search.

  • The search is complete, and the results can be previewed without any issue.

  • When the results are exported to a target eDiscovery mailbox, the process fails and returns the following error message:​​​​​​​

An unknown error occurred on the search server. Please contact your administrator for assistance.

'Export failed with error type: 'Unauthorized'. Details: The request failed with HTTP status 401: Unauthorized.'.

Resolution

To fix this issue, install the following security updates:

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