Understanding CAS proxying and redirection
The Exchange 2013 CAS role doesn’t directly serve any data to clients; instead, it provides two ways for clients to connect to the correct server: proxying and redirection. In a proxied connection, the CAS accepts data from the client and forwards it to the correct server; in a redirected connection, the CAS responds to the client request with the FQDN of the server it should ideally be talking to.
In Exchange 2013, the CAS only redirects connections in a very limited number of cases. That is by design because redirections shift work from the server to the client by forcing it to reconnect, and not all clients properly handle redirections.
Proxying
CAS proxying was fairly complicated in Exchange 2007 and ...
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