OWA application pool crashes with KeyNotFound exception in Exchange Server 2013

Symptoms
In a Microsoft Exchange Server 2013 environment, the OWA application pool crashes several times a day. In this situation, the following event is logged:


Date 
Time
Error
server.domain.com
4999
MSExchange Common General
N/A Watson report about to be sent for process id: process id , with parameters: E12, BuildType, VersionNumber, w3wp#MSExchangeOWAAppPool, M.Exchange.Services, M.E.S.C.T.ParticipantInformationDictionary.GetParticipant, S.C.Generic.KeyNotFoundException, XXXX, VersionNumber. ErrorReportingEnabled: True


Cause
This issue occurs because Exchange Server expects all meeting participants to be rendered. However, for some special meetings, some participants may not be rendered successfully. When this issue occurs, a KeyNotFound exception is displayed, and the OWA application pool crashes.
Resolution
To fix this issue, install Cumulative Update 13 for Exchange Server 2013 or a later cumulative update for Exchange Server 2013.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.
Properties

Article ID: 3140102 - Last Review: 06/21/2016 17:46:00 - Revision: 1.0

Microsoft Exchange Server 2013 Enterprise, Microsoft Exchange Server 2013 Standard

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