Hello,
We are running a two-node Exchange 2019 DAG behind a Kemp LB. Since the Feb CU and SU updates, I've seen continuous 4999 errors in the Event Viewer.
Error 1:
Watson report about to be sent for process id: 18868, with parameters: E12, c-RTL-AMD64, 15.02.1118.026, w3wp#MSExchangeSyncAppPool, MSExchange ActiveSync, Microsoft.Exchange.AirSync.Common.SchemaConverter.Entity.EntityContentProperty.get_MIMEData, UnexpectedCondition:NotImplementedException, 76de, 15.02.1118.026.
ErrorReportingEnabled: True
exData=|exHResult=|exStacktrace=at Microsoft.Exchange.AirSync.Common.SchemaConverter.Entity.EntityContentProperty.get_MIMEData()
at Microsoft.Exchange.AirSync.Common.SchemaConverter.AirSync.AirSyncContentProperty.InternalCopyFrom(IProperty sourceProperty)
at Microsoft.Exchange.AirSync.Common.SchemaConverter.AirSync.AirSyncContent14Property.InternalCopyFrom(IProperty sourceProperty)
at Microsoft.Exchange.AirSync.Common.SchemaConverter.AirSync.FlexibleSchemaStrategy.ExecuteCopyProperty(IProperty srcProperty, AirSyncProperty dstAirSyncProperty)
at Microsoft.Exchange.AirSync.Common.SchemaConverter.AirSync.AirSyncDataObject.CopyFrom(IProperty srcRootProperty)
at Microsoft.Exchange.AirSync.MailboxItemFetchProvider.BuildResponse(XmlNode responseNode)|exTargetSite=MSExchange ActiveSync Microsoft.Exchange.AirSync.Common.SchemaConverter.Entity.EntityContentProperty.get_MIMEData|exSource=|exMessage=|exComplete=
Error 2:
Watson report about to be sent for process id: 19480, with parameters: E12IIS, c-RTL-AMD64, 15.02.1118.026, w3wp#MSExchangeOWAAppPool, M.E.C.Owa2.Server, M.E.C.O.S.C.OwaMapiNotificationManager.SubscribeToSuiteNotification, System.NotSupportedException, 80d2-dumptidset, 15.02.1118.026.
ErrorReportingEnabled: True
Error 3:
Watson report about to be sent for process id: 27204, with parameters: E12IIS, c-RTL-AMD64, 15.02.1118.026, w3wp#MSExchangeServicesAppPool, M.Exchange.Services, M.E.S.C.T.ServiceResult`1.ProcessServiceResults, System.ArgumentNullException, feb4-dumptidset, 15.02.1118.026.
ErrorReportingEnabled: True
I've tried the following to resolve the issue:
1. run a .NET repair.
2. Recycle AppPools
3. Checked that OAuth is valid
4. Make sure that all certificates are valid
5. confirm virtual directories have the correct FQDN
6. multiple reboots
I haven't received any connection issues besides a few of Outlook autodiscover redirect popups.
Open to any suggestions.
