E14 Overview CAS Proxy AND Redirection

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1. A Client Access server can also perform redirection for Microsoft Office Outlook Web 應用程式 URLs. Redirection is useful when a user is connecting to a Client Access server that isn't in their local Active Directory site.

2. If you don't have multiple Active Directory sites in your organization, you don't have to configure Exchange 2010 for proxying or redirection.

3. in Microsoft Exchange Server 2003, the front-end server communicates with the back-end server over HTTP. In Exchange 2010, the Client Access server communicates with the Mailbox server over RPC. You must have an Exchange 2010 Client Access server in every Active Directory site that contains a Mailbox server. Proxying occurs when one Client Access server sends traffic to another Client Access server. An Exchange 2010 Client Access server can proxy requests in the following two situations:

  • Between Exchange 2010 Client Access servers   Proxying requests between two Exchange 2010 Client Access servers enables organizations that have multiple Active Directory sites to designate one Client Access server as an Internet-facing server and have that server proxy requests to Client Access servers in sites that have no Internet presence. The Internet-facing Client Access server then proxies the request to the Client Access server closest to the user's mailbox. This is known as CAS-CAS proxying.
  • Between an Exchange 2010 Client Access server and Exchange 2007 Client Access servers   Proxying requests between an Exchange 2010 Client Access server and an Exchange 2007 Client Access server enables Exchange 2010 and Exchange 2007 to coexist in the same organization.

4. Proxying is supported for clients that use Outlook Web 應用程式, Exchange ActiveSync, and Exchange Web Services. Although the Availability service supports proxying, it has its own built-in logic for handling proxying and doesn't require explicit configuration. Proxying is supported from one Client Access server to another Client Access server when the destination Client Access server is running the same version of Microsoft Exchange as, or an earlier version of Microsoft Exchange than, the source Client Access server. The following figure shows how proxying works in an organization that has multiple Client Access servers and multiple Mailbox servers.

5. In each Exchange organization, only one Client Access server must be Internet-facing. A Client Access server that has no Internet presence doesn't have to have its own Internet host name. It relies on the Internet-facing Client Access server to proxy all pertinent requests from external clients.

6. Proxying won't work for Post Office Protocol version 3 (POP3) or Internet Message Access Protocol version 4rev1 (IMAP4) clients. A client who's using POP3 or IMAP4 must connect to a Client Access server in the same Active Directory site as their Mailbox server.

7. Communications between Client Access servers in different sites occur over Secure HTTP (HTTPS).

8. If User 1 tries to access Client Access server 02 using Exchange ActiveSync, they'll receive an error because Client Access server 01 is the appropriate Client Access server for their mailbox.

 

Blog Extended Reading

More Information & Reference
Understanding Proxying and Redirection


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