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This article provides brief information and steps to resolve the error when the Core Businesslayer plugin crashes on Start up. The following error message is seen:
2016-02-15 13:12:16,761  ERROR SolarWinds.BusinessLayerHost.PluginInstanceAppDomain - Plugin "Core Business Layer" failed to start.
System.IO.IOException: The file exists.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.Path.InternalGetTempFileName(Boolean checkHost)
at SolarWinds.Orion.Core.CertificateUpdate.Md5CertificateUpdater..ctor(Boolean onlySynchronizeCertificateWithDatabase, TimeSpan agentStatusPollFrequency)
at SolarWinds.Orion.Core.BusinessLayer.CoreBusinessLayerService..ctor(CoreBusinessLayerPlugin pluginParent, IFeatureManager featureManager, IPackageManager packageManager, INodeBLDAL nodeBlDal, IAgentInfoDAL agentInfoDal, ISettingsDAL settingsDal)
at SolarWinds.Orion.Core.BusinessLayer.CoreBusinessLayerService..ctor(CoreBusinessLayerPlugin pluginParent, IFeatureManager featureManager)
2016-02-15 13:12:16,761  INFO SolarWinds.BusinessLayerHost.PluginInstanceSeparateProcess - Starting plugin E:\Program Files (x86)\SolarWinds\Orion\AgentManagement\SolarWinds.AgentManagement.ServiceCore.dll.config - ProcessID:33112
The error above is referencing InternalGetTempFileName during the certificate update.
The issue is caused by the large number of files in C:\Windows\Temp.
If the Web Console still will not open, you can check the following logs to confirm the CoreBusinessLayer is now starting correctly:
If they are starting correctly run through removing and rebuilding the website. Refer to https://support.solarwinds.com/Succe..._Orion_Website.