Have ISA 2006 multihomed server. NIC 1 in DMZ, NIC 2 in LAN.Attempting to connect to Exchange 2007 HUB/CAS Server running on Server 2008.Everything fully patched.Have Internal CA configured.when attempting to connect to owa from outside, IE connects, brings up cert warning, presents OWA login page.If Login Credentials are invalid - Interface correctly reports bad login information.If login Credentials are valid, the interface times out and presents the cannot display page message.It appears that the ISA cannot pull information from IIS on the HUB/CAS Server.Suggestions?ISA publishing rules are exact matches to an existing, production Exchange 2003 environment.

hi,please look at here about publishing owa over isa server 2006 ;http://www.msexchange.org/tutorials/Publishing-Exchange-2007-OWA-ISA-Server-2006.htmlregards,Mumin CICEK | Exchange - MVP | www.cozumpark.com | www.mumincicek.com

Hi, ISA published OWA 2003 to internet. Now you want to access OWA 2007 from internet, is that true? Then Id like to know how is the mail flow? Exchange 2003-connector-Exchange 2007-internet? Exchange 2007-connector-Exchange 2003-internet? I recommend you to publish OWA 2007 via ISA. More information to share with you: Outlook Web Access and Exchange 2007, 2003 and 2000 coexistence http://msexchangeteam.com/archive/2007/02/07/434523.aspx Regards, Xiu

OWA 2007 has been published via ISA 2007 according to article mentioned in 1st reply.The default connector is in place and functional between 2003 & 2007.Before modifying Forms Authentication on 2007 exchange/owa, all mailboxes (2003 & 2007) were accessible via https://2007server/exchange(intranet).Again, the ISA will provide the login interface for OWA AND it will verify credentials (bad credentials are verified as bad), but when retrieving the information from the HUB server, connect fails and you get "IE cannot display the webpage".I have re-verified the settings on the ISA rules several times, but cannot find the problem. Problem may be certificate related. I have an enterprise root MS cert server on root domain controller that appears to be successfully handing out certs. Again, any suggestions greatly appreciated.

Does your ISA server trust your internal CA and also the client accessing your CAS server? Ensure that the are no errors on the web listener within ISA for the certificate or within the certificates MMC.

Hi,when retrieving the information from the HUB server, connect fails and you get "IE cannot display the webpage". I'd like to know what action has been done when the error occur, just during the authentication period?Is there any redirect has been done on the CAS server?Please ensure that you have Basic Authentication in the Authentication tab on CAS server propertise.Besides,please try to delete the OWA publishing rule and then publish OWA again.Publishing Exchange Server 2007 with ISA Server 2006http://technet.microsoft.com/en-us/library/bb794751.aspxRegards,Xiu