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"Invalid user context cookie found in proxy response" error message and an event ID 4999 occur when you use an Exchange 2010 SP2 RU1 CAS server as a proxy to an Exchange 2007 CAS server

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Symptoms

Consider the following scenario:
  • You configure a server that is running Microsoft Exchange Server 2010 Service Pack 2 (SP2) as a Client Access server (CAS).
  • The server that is running Exchange Server 2010 SP2 is used as a proxy to a server that is running Microsoft Exchange Server 2007.
  • You install Microsoft Exchange Server 2010 SP2 Update Rollup 1 (RU1) on the proxy server.
In this scenario, the proxy connection fails from the server that is running Exchange Server 2010 SP2 RU1 server to the server that is running Exchange Server 2007. And, you receive an error message that resembles the following:
Invalid user context cookie found in proxy response
Additionally, an event that resembles the following is logged in Event Viewer:

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Cause

This issue occurs because of change to the user context cookie in Exchange Server 2010 SP2 RU1.

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Workaround

To work around this issue, use redirection instead of using a proxy.

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References

For more information about Update Rollup 7 for Exchange Server 2007 SP3, visit the following TechNet website:
http://blogs.technet.com/b/exchange/archive/2012/04/16/released-update-rollup-7-for-exchange-2007-service-pack-3.aspx

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Keywords: kb, kbsurveynew, kbentirenet, kbtshoot, kbprb, kbfix

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Article Info
Article ID : 2696649
Revision : 2
Created on : 5/19/2020
Published on : 5/19/2020
Exists online : False
Views : 85