[Sophos Notification] Advisory: Sophos Central Admin: ADsync utility - "Failed active directory synchronization" errors have been experienced by some customers intermittently since May 21st.

Hi Community,


Sophos is currently investigating some reports of the Sophos Central ADsync Utility intermittently reporting a "Failed active directory synchronization" error, with no intervention or changes with the account used to login.

This is primarily seen during a configured scheduled sync times (vs manual syncing), and this particular failure started on or after May 21st.

Example error:

  • HTTP request to cloud.sophos.com/.../sessions error InternalServerError:
  • Failed active directory synchronization. Reason: System.Net.Http.HttpRequestException --->CommandLib.HttpRequestCommand+HttpStatusException: Exception of type 'CommandLib.HttpRequestCommand+HttpStatusException' was thrown.
  • --- End of inner exception stack trace ---
  • at CommandLib.HttpRequestCommand.EnsureSuccessStatusCodeResponseChecker.CheckResponse(HttpResponseMessage response)


Sophos is actively investigating. This KB article will be updated as more information becomes available.

  • [Update] 29th May

    The issue has been resolved.

    Error 'HttpRequestCommand.EnsureSuccessStatusCodeResponseChecker' can still occur for the different reason. Please refer to the "What to do" section of this article