Non Internet facing owa prompt for username and password

AblSysadmin
AblSysadmin used Ask the Experts™
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Hi, as title stated I have an issue with the Non Internet facing OWA prompt for username and password. The internet facing site works 100%. Redirection is also working with no issues.
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Does the user changed the password when using the VPN / outside the company ?? Any more description for the actual situation ??
AblSysadminSenior Systems Engineer

Author

Commented:
Sorry about that. We have two exchange sites. Site A is in HQ and site B is our DR site.  Users from HQ and external users access the servers in site A.  If external users from site B want to access their mail they get prompted for username and a password. Site A is the internal facing site and site B is not.  If a user on site B tries to access the CAS servers directly they still get prompted for username and password.  Site A OWA authentication settings are set to forms based with username only and site B is set to integrated windows authentication.  
AblSysadminSenior Systems Engineer

Author

Commented:
Also I followed this article :http://technet.microsoft.com/en-us/library/bb310763.aspx.
made not diff.
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maybe can try this :

http://exchangeserverpro.com/exchange-server-2010-outlook-web-app-authentication-settings

Try to change to Forms-Based Authentication (for Site B) and see whether it helps.
AblSysadminSenior Systems Engineer

Author

Commented:
Will give it a try.
AblSysadminSenior Systems Engineer

Author

Commented:
it works but the redirection betweem the two sites does not work now

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