Outlook AnyWhere betwen Sites

Hi ALL,

My environment there are two sites. Internet Facing Site A and Non-Internet Facing Site B.

The mailbox that are on the Site A it's working via Outlook AnyWhere.

But, the mailbox on the Site B isn't work.

I configure Outlook AnyWhere (from internet) to connect https, click in check name and mailbox its OK.

I type user and password and the mailbox authentication on the CAS Server (Proxying), configuration with success.

When I open Outlook client, show this message:

Cannot start microsoft outlook. cannot open a the outlook window. the set of folders cannot be opened. you must connect to Microsoft Exchange.

OBS:

I configured Mailbox Database (Site B) RPCClientAccessServer to CAS Internet Facing (Site A).

Set-MailboxDatabase "mailbox" -RPCClientAccessServer "cas.internet.facing"

Any idea?

Regards

R.Blanco