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Exchange '10 CAS OWA (Default Web Site) Properties for Authentication

Posted on 2014-10-16
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Last Modified: 2014-10-21
Looking for the best recommendation on what the authentication settings of OWA for Exchange 2010 under the Default Web Site properties should be set to.

Goal is to have OWA exposed out to the Internet via SSL only and to have all mailbox access login with domain\user name is fine. Would like to have this passed through from a single sign-on for Citrix so would Integration Windows be required or could that be form-based?
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Question by:RTM2007
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Simon Butler (Sembee) earned 2000 total points
ID: 40385500
Forms Based Authentication is the preferred method for authentication on OWA, as access is controlled by a cookie. That means when you sign out, the session is closed. Any other method allows access back in again.

However single sign on from Citrix would probably require Windows authentication. Therefore if you want to do both, you will need to create a second web site for the different authentication methods.

This is covered by an Exchange team blog.
http://blogs.technet.com/b/exchange/archive/2011/01/17/configuring-multiple-owa-ecp-virtual-directories-on-exchange-2010-client-access-server.aspx

Simon.
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by:RTM2007
ID: 40385553
Thank you. For the standard authentication methods, is the basic authentication (password is sent in clear text) on by default? This seems not as secure that it is transmitted in plain text but not sure if undoing that setting would break authentication somehow.
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by:Simon Butler (Sembee)
ID: 40385560
By default it should be forms based authentication - I am talking about Exchange authentication here, not whatever you see in IIS manager. FBA will use plain text, because the password will be within an SSL session.

Simon.
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by:RTM2007
ID: 40385570
Yes, I meant the OWA default site permissions under the authentication tab. The top setting is to use basic and the third check box is that password is sent in plain text (basic)
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by:Simon Butler (Sembee)
ID: 40385584
In a default configuration those would be greyed out and the forms based authentication methods enabled.

Simon.
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