Exchange 2007 and CAS from Exchange 2010 problem

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Igor L. Kravchenko

Hello, we have Exchange 2007. Now I installed CAS 2010. When I try to use CAS 2010 to connect using OWA, it works internally. When I try to login when I am outside of the firewall, it prompts me to login. After I entered user name and password, it goes to https://externaldomainname/owa/auth.owa and gives me "page cannot be found" error.

I am working with Microsoft for about a month now and nothing.

Anyone has any ideas? I changed DNS (obviously it is correct because I see 2010 OWA login page), changed Firewall and nothing. I worked with Firewall support and they told me that packets are forwarded to the CAS 2010 server but nothing coming back.

Thank you.

Mitesh Gosar


If you are accessing Exchange 2007 mailbox through Exchange 2010 CAS then your OWA url will be redirect to Exchange 2007 CAS server.

For e.g.: If mailbox on Ex2k7MBX and accessing through Ex 2010 CAS server after login credential your OWA URL will be redirect to Ex 2007 CAS server

- Mitesh Gosar| Skype:Mitesh.Gosar

Brian Day MCITP

What kind of firewall is in place? What are your ExternalURL values for the 2007CAS servers set to? What Auth type are the OWA vDirs for CAS2007? Is it Exchange 2010 SP1 RU1, or some older version?

Igor L. Kravchenko

I will try to answer.

Yes, it redirects to Exchange 2007 CAS server. When I login internally, I can see that URL changes to internal Exchange 2007 CAS server.

We use SonicWall 4060 Pro Enhanced. I worked with support and they are telling me that everything works correct. I have an entry on the firewall for CAS server. All I had to do is to change IP address for that entry.

ExternalURL for 2007 CAS server is empty and it is setup to Integrated Windows Authentication. 2010 CAS server has external URL https://externalurl/owa and it is setup to use form-based authentication.

Version for Exchange 2010 is 14.00.0702.000.

I am working with Microsoft for about a month now. The guy is telling me that everything is setup correctly.

Any ideas?

Thank you.

Brian Day MCITP

Are you trying to force a Proxy to happen instead of a normal single-sign-on redirection to a legacy URL?
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