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Ex 2016 Cu22 upgrade is now causing ELCLastSuccessTimestamp and get-serverhealth compliance errors

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When running get-serverhealth checks on our on prem 2016 Exchange servers, after upgrading to cu22, I am now seeing compliance failures. Upon further investigation using the powershell command

Get-HealthReport -Server $server | where {$_.AlertValue -ne "healthy"} | fl

SerializationData       : {0, 1, 0, 0, 0, 255, 255, 255, 255, 1, 0, 0, 0, 0, 0, 0...}
RunspaceId              : 788647cb-a334-46ca-914e-2c28aa7f98ff
Server                  : nsc-dagc-06
State                   : NotApplicable
HealthSet               : Compliance
HealthGroup             : CustomerTouchPoints
AlertValue              : Unhealthy
LastTransitionTime      : 11/24/2021 10:04:15 AM
MonitorCount            : 43
HaImpactingMonitorCount : 0

and running

Get-MonitoringItemIdentity -Identity "Compliance" -Server $server | where {$_.Name -eq "ELC
MailboxSLAMonitor"}


SerializationData : {0, 1, 0, 0, 0, 255, 255, 255, 255, 1, 0, 0, 0, 0, 0, 0...}
RunspaceId        : 788647cb-a334-46ca-914e-2c28aa7f98ff
Server            : nsc-dagc-06
HealthSetName     : Compliance
Name              : ELCMailboxSLAMonitor
TargetResource    : Compliance
ItemType          : Monitor
Identity          : Compliance\ELCMailboxSLAMonitor\Compliance
IsValid           : True
ObjectState       : New

I then checked the Exchange logs and saw the following

Probe: {Compliance/ELCComponent_LastSuccessTooLongAgo} Mailbox guid: {xxxxx} In Org: {} Is archive: {IsArchiveMailbox = False} With stack trace: {The difference: 385.248046682816 days between today: 11/24/2021 12:24:19 PM and the date of last successful ELC run: 11/4/2020 6:27:07 AM for mailbox: e43093f4-01ae-4958-a4ad-75ca6b828392 is above the threshold: 7; Exception message: Microsoft.Exchange.Context.Core.SignalSignalTypeNotRegisteredException.} Get last ELC exception from Export-MailboxDiagnosticLogs -Component MRM then statistics with -ExtendedProperties and look at all ELC properties, specifically the value of ELCLastSuccessTimestamp. If mailbox is Archive use -Archive.

so I ran Export-MailboxDiagnosticLogs against the mailbox after using get-mailbox and the guid it gave

Export-MailboxDiagnosticLogs -Component MRM -Identity xxxxx


RunspaceId  : cbe6428b-38e2-4059-a087-24ed75cf34b7
MailboxLog  : 11/24/2021 12:24:18 PM Exception:
              Microsoft.Exchange.Context.Core.SignalSignalTypeNotRegisteredException: Forbidden Exception: This is an
              unregistered SignalType 399.
                 at Microsoft.Exchange.Context.Core.SignalTypeMapper.GetSignalType(Int32 signalTypeId)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SignalFolderExpirationEnforcer.EnlistItem(Prope
              rtyArrayProxy itemProperties)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SignalFolderExpirationEnforcer.DeleteItemsPastR
              etention(IFolder folder, QueryFilter pastRetentionQueryFilter)
                 at
              Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SignalFolderExpirationEnforcer.CollectItemsToExpire()
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SysCleanupEnforcerBase.CollectItemsWithGuard()
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SysCleanupEnforcerBase.InvokeInternal()
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SysCleanupEnforcerBase.Invoke()
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.ELCAssistant.InvokeSysCleanupEnforcer(MailboxDa
              taForTags mailboxDataForTags, SysCleanupEnforcerBase enforcer)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.ELCAssistant.InvokeCore(MailboxSession
              mailboxSession, List`1 customDataToLog, StatisticsLogEntry logEntry, ElcParameters parameters)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.ELCAssistant.<>c__DisplayClass30_0.<InvokeInter
              nalAssistant>b__0()
                 at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate,
              Action`1 catchDelegate)
              11/23/2021 12:18:00 PM Exception:
              Microsoft.Exchange.Context.Core.SignalSignalTypeNotRegisteredException: Forbidden Exception: This is an
              unregistered SignalType 399.
                 at Microsoft.Exchange.Context.Core.SignalTypeMapper.GetSignalType(Int32 signalTypeId)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SignalFolderExpirationEnforcer.EnlistItem(Prope
              rtyArrayProxy itemProperties)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SignalFolderExpirationEnforcer.DeleteItemsPastR
              etention(IFolder folder, QueryFilter pastRetentionQueryFilter)
                 at
              Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SignalFolderExpirationEnforcer.CollectItemsToExpire()
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SysCleanupEnforcerBase.CollectItemsWithGuard()
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SysCleanupEnforcerBase.InvokeInternal()
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SysCleanupEnforcerBase.Invoke()
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.ELCAssistant.InvokeSysCleanupEnforcer(MailboxDa
              taForTags mailboxDataForTags, SysCleanupEnforcerBase enforcer)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.ELCAssistant.InvokeCore(MailboxSession
              mailboxSession, List`1 customDataToLog, StatisticsLogEntry logEntry, ElcParameters parameters)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.ELCAssistant.<>c__DisplayClass30_0.<InvokeInter
              nalAssistant>b__0()
                 at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate,
              Action`1 catchDelegate)
              11/22/2021 12:20:23 PM Exception:
              Microsoft.Exchange.Context.Core.SignalSignalTypeNotRegisteredException: Forbidden Exception: This is an
              unregistered SignalType 399.
                 at Microsoft.Exchange.Context.Core.SignalTypeMapper.GetSignalType(Int32 signalTypeId)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SignalFolderExpirationEnforcer.EnlistItem(Prope
              rtyArrayProxy itemProperties)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SignalFolderExpirationEnforcer.DeleteItemsPastR
              etention(IFolder folder, QueryFilter pastRetentionQueryFilter)
                 at
              Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SignalFolderExpirationEnforcer.CollectItemsToExpire()
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SysCleanupEnforcerBase.CollectItemsWithGuard()
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SysCleanupEnforcerBase.InvokeInternal()
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SysCleanupEnforcerBase.Invoke()
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.ELCAssistant.InvokeSysCleanupEnforcer(MailboxDa
              taForTags mailboxDataForTags, SysCleanupEnforcerBase enforcer)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.ELCAssistant.InvokeCore(MailboxSession
              mailboxSession, List`1 customDataToLog, StatisticsLogEntry logEntry, ElcParameters parameters)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.ELCAssistant.<>c__DisplayClass30_0.<InvokeInter
              nalAssistant>b__0()
                 at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate,
              Action`1 catchDelegate)
              11/21/2021 12:21:36 PM Exception:
              Microsoft.Exchange.Context.Core.SignalSignalTypeNotRegisteredException: Forbidden Exception: This is an
              unregistered SignalType 399.
                 at Microsoft.Exchange.Context.Core.SignalTypeMapper.GetSignalType(Int32 signalTypeId)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SignalFolderExpirationEnforcer.EnlistItem(Prope
              rtyArrayProxy itemProperties)
                 at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.SignalFolderExpirationEnforcer.DeleteItemsPastR
              etention(IFolder folder, QueryFilter pastRetentionQueryFilter)

LogName     : MRM
Identity    : xxxxx
IsValid     : True
ObjectState : Unchanged

I can't find anything that tells me what code 399 is? Has anyone else seen this when upgrading to cu22? When I exported the mailbox diagnostic logs for that user (there are multiple mailboxes generating this on multiple servers with no obvious pattern) I did see

ELCLastSuccessTimestamp 11/4/2020 6:27:07 AM

when if the Manager Folder Assistant was working correctly on the mailboxes causing the compliance issue, the ELCLastSuccessTimestamp time stamp and date would be within 7 days of today. Could something be corrupted and prohibiting the MFA from checking this mailbox? This did not show up with the last cu, cu20.

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Louisl avatar
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Louisl
I have to say I never see such errors, but I think you should check the MS Exchange Mailbox Assistants service and restart it. Then try starting the MFA manually with https://docs.microsoft.com/en-us/powershell/module/exchange/start-managedfolderassistant?view=exchange-ps
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