I'm trying to generate an Effective Access Rights Report from the web client () and I keep getting this error message: "Error encountered when receiving an HTTP response."

Web Client Version 11.0.2308.28

This is what I'm seeing in the Event Viewer on the server: 

Error encountered when receiving an HTTP response.
OperationID: 0000431533a22596e1c719831350ec4d
Operation: StartUserEffectiveRightsReport
  Message: Exception details:
  Message: Error encountered when receiving an HTTP response.
  Stack trace:    at OpenXmlPowerTools.SpreadsheetWriter.Write(String fileName, WorkbookDfn workbook)
   at Laserfiche.WebAccess.Common.Security.UserEffectiveRightsReport.StartExportFunc(UserEffectiveRightsReportArgs arguments)
  Message: An HTTP operation has timed out.
  Stack trace: 
Exception encountered, stack trace:
  Laserfiche.WebAccess.Common.Util.ErrorHandler.LogException
  Laserfiche.WebAccess.Common.Util.ErrorHandler.Standardize
  Laserfiche.WebAccess.Common.Security.UserEffectiveRightsReport.StartExportFunc
  Laserfiche.WebAccess.Common.Util.ThreadPoolWrapper.RunWrapper
  System.Threading.ExecutionContext.RunInternal
  System.Threading.ExecutionContext.Run

  Repository: MAIN
  Session: fffojiku

Has anyone seen this happen before and know how to resolve it?

Thank you!