Article ID: 2661277 - View products that this article applies to.
Consider the following scenario:
This issue occurs because the protocol version of the request is logged incorrectly on the CAS server.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2661854/ )Description of Update Rollup 2 for Exchange Server 2010 Service Pack 2
After the update is installed, the CAS server acts as a proxy for requests from versions of EAS protocol that are earlier than EAS 12.1. Additionally, the CAS server redirects requests from versions of EAS that are later than EAS 14.0.
For more information about proxies and redirection, visit the following Microsoft website:
General information about proxies and redirection
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