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Home > Success Center > Network Performance Monitor (NPM) > Database Details page error: Not a legal OleAut date

Database Details page error: Not a legal OleAut date

Created by Norsolihati Selamat, last modified by MindTouch on Jun 23, 2016

Views: 46 Votes: 0 Revisions: 7


The following error appears when trying to load the Database Details page in NPM:

Unexpected Website Error

Not a legal OleAut dateerror.png
The following is found in the BuinessLayerHost.Log file:

ERROR SolarWinds.BusinessLayerHost.PluginInstanceAppDomain - Plugin "Core Business Layer" failed to start.
System.ArgumentException: Not a legal OleAut date.
   at System.DateTime.DoubleDateToTicks(Double value)
   at SolarWinds.Orion.Core.BusinessLayer.DAL.HistoryTableDdlDAL.EnsureHistoryTables()
   at SolarWinds.Orion.Core.BusinessLayer.CoreBusinessLayerPlugin.Start()
   at SolarWinds.BusinessLayerHost.Contract.BusinessLayerPlugin.Start()
   at SolarWinds.BusinessLayerHost.PluginInstanceAppDomain.Start()


All NPM versions


  1. ​Create a backup of the Orion database.
  2. Run the following SQL sript:
    Update Settings SET CurrentValue=42047.4430 Where SettingID=N'SWNetPerfMon-Settings-Last Archive'
  3. Restart the SolarWinds services. Refer to Start and stop Orion Services.


Last modified
22:04, 22 Jun 2016