Hi

Occasionally I see the  error 178008 OAB Generator Assistance. 

Has anyone see this before and can tell me what the issue might be.

Cheers

Laurie

++++++++++++++++++++++++++++++

Log Name:      Application
Source:        MSExchangeMailboxAssistants
Date:          1/02/2015 8:08:06 PM
Event ID:      17008
Task Category: OAB Generator Assistant
Level:         Error
Description:
OABGeneratorAssistant encountered an error not related to any specific OAB.       
System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.Exchange.MailboxAssistants.Assistants.OABGenerator.OABGeneratorAssistant.GetOABsFromAD(OABGeneratorTaskContext context, Guid oabObjectGuid)
   at Microsoft.Exchange.MailboxAssistants.Assistants.OABGenerator.OABGeneratorAssistant.InitializeOABGeneration(AssistantTaskContext assistantTaskContext)
   at Microsoft.Exchange.MailboxAssistants.Assistants.OABGenerator.OABGeneratorAssistant.<>c__DisplayClasse.<ProcessAssistantStep>b__a()
   at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(TryDelegate tryDelegate, FilterDelegate filterDelegate, CatchDelegate catchDelegate)
   at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(TryDelegate tryDelegate, FilterDelegate filterDelegate, CatchDelegate catchDelegate)     
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MSExchangeMailboxAssistants" />
    <EventID Qualifiers="49156">17008</EventID>
    <Level>2</Level>
    <Task>17</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2015-02-01T10:38:06.000000000Z" />
    <EventRecordID>5032334</EventRecordID>
    <Channel>Application</Channel>
    <Security />
  </System>
  <EventData>
    <Data>System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.Exchange.MailboxAssistants.Assistants.OABGenerator.OABGeneratorAssistant.GetOABsFromAD(OABGeneratorTaskContext context, Guid oabObjectGuid)
   at Microsoft.Exchange.MailboxAssistants.Assistants.OABGenerator.OABGeneratorAssistant.InitializeOABGeneration(AssistantTaskContext assistantTaskContext)
   at Microsoft.Exchange.MailboxAssistants.Assistants.OABGenerator.OABGeneratorAssistant.&lt;&gt;c__DisplayClasse.&lt;ProcessAssistantStep&gt;b__a()
   at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(TryDelegate tryDelegate, FilterDelegate filterDelegate, CatchDelegate catchDelegate)
   at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(TryDelegate tryDelegate, FilterDelegate filterDelegate, CatchDelegate catchDelegate)</Data>
  </EventData>
</Event>

Hi FramingNut,

Is there any changes cause this issue?

Do you migrate from previous Exchange server to Exchange 2013?

 

Thanks

Hi Mavis

I migrated from exchange 2007 to exchange 2013
There does not "appear" to be a problem with the OAB but obviously there is something wrong. I get this error message once a day. Early in the morning. From the error message it looks like a programming issue with the function GetOABsFromAD or the parameters passed to this function.

I was wondering if anyone else is seeing this error on their ex2013 installation?

Cheers

Laurie

Hey Laurie

Did you find out what was causing this issue in your environment I'm having the exact same issue on mine. :-(

thanks

Hi Sergio

I have no idea why this is happening. I still see it. If you find an answer please let me know

Cheers

Laurie

Hi Sergio

After I applied CU9 the problem disappeared. This was the result on both the test env and the production env.

Now if only MS would fix that ProcessKillBit warning that everyone is seeing.

Cheers

Laurie

• Marked as answer by FramingNut 8 hours 9 minutes ago