Exchange 2016: EventID 1006 - Event Dispatchers Catching Up

On Exchange 2016 servers, the following event is sometimes written to the application log every 30 minutes:

Source: MSExchangeDiagnostics

Event ID: 1006

The performance counter '\\EXCHANGE\MSExchange Assistants - Per Database(msexchangemailboxassistants-fwdb)\Event Dispatchers Catching Up' sustained a value of '2.730,00', for the '30' minute(s) interval starting at '10.01.2018 19:39:00'. Threshold breached since '25.12.2017 21:09'. None Trigger Name:EventDispatchersCatchupQueueTrigger. Instance:msexchangemailboxassistants-fwdb

This bug also existed in Exchange 2013. The workaround to prevent the annoying entries in the log still works perfectly.

In the Exchange BIN directory under $exinstall\bin there is a file with the following name:

• Microsoft.Exchange.Diagnostics.Service.exe.config

In this file, the line with the following entry must be changed:

<add Name=“Microsoft.Exchange.Diagnostics.Service.ExchangeJobs.Triggers.EventDispatchersCatchupQueueTrigger“ Assembly=“Microsoft.Exchange.Diagnostics.Service.ExchangeJobs.dll“ Enabled=“True“ Role=“Mailbox“/>

The line is changed as follows (Enabled="false"):

<add Name=“Microsoft.Exchange.Diagnostics.Service.ExchangeJobs.Triggers.EventDispatchersCatchupQueueTrigger“ Assembly=“Microsoft.Exchange.Diagnostics.Service.ExchangeJobs.dll“ Enabled=“false“ Role=“Mailbox“/>

In my case it is line 1440:

After the line has been changed, the "Microsoft Exchange Diagnostics" service must be restarted once.

The error is no longer written to the log.