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.
Additionally, an event that resembles the following is logged in Event Viewer:
Invalid user context cookie found in proxy response
This issue occurs because of change to the user context cookie in Exchange Server 2010 SP2 RU1.
To resolve this issue, download and install Update Rollup 7 for Exchange Server 2007 SP3. For information about how to download and install Update Rollup 7 for Exchange Server 2007 SP3, visit the following Microsoft website:
To work around this issue, use redirection instead of using a proxy.
For more information about Update Rollup 7 for Exchange Server 2007 SP3, visit the following TechNet website:
Article ID: 2696649 - Last Review: Jun 21, 2014 - Revision: 1
Microsoft Exchange Server 2007 Service Pack 3