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  2. HttpProxy overloads a downlevel CAS in an Exchange Server 2013 coexistence environment

HttpProxy overloads a downlevel CAS in an Exchange Server 2013 coexistence environment

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Symptoms

Consider the following scenario:
  • You deploy Microsoft Exchange Server 2013 and Exchange Server 2007 or Exchange Server 2010 in a coexistence environment.
  • Exchange 2013 HttpProxy tries to locate an earlier version client access server (CAS), such as an Exchange Server 2007 or Exchange Server 2010 CAS.
  • The load from Exchange 2013 HttpProxy to Exchange Server 2007 or Exchange Server 2010 CAS server isn't distributed equally. The pre-Exchange 2013 load is concentrated on a few servers, and other servers have almost no load.
In this scenario, HttpProxy routes to an earlier version client access server, and then that client access server is overloaded.

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Cause

This issue occurs because hashing algorithm doesn't handle well for the Exchange server naming and Exchange server version.

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Resolution

To fix this issue, install Cumulative Update 12 or a later cumulative update for Exchange Server 2013.

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Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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Keywords: kbqfe, kbsurveynew, kbfix, kbexpertiseinter, kb

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Article Info
Article ID : 3128706
Revision : 1
Created on : 1/7/2017
Published on : 3/15/2016
Exists online : False
Views : 279