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Need to authenticate twice for OWA access - 20.Jan.2008 6:48:19 AM

birdy

Posts: 1
Joined: 20.Jan.2008
Status: offline

Hi all,

I am having a very strange problem. my ISA 2006 is located in the dmz.
I conigured forms based authentication on the OWA and changed the exchange 2007 to basic authentication.
When I try to open owa from a computer which is not a domain member I only to to authenticate one time and it is ok, Byt when I try to login to OWA from a computer which is part of the domain, I need to authenticate twice before I get my mailbox. it looks like the first authentication is the owa form and the second one is the exchange form, althogh I marked it to basic authentication and run iisreset/noforce.
Any idea????

Thanks a lot for your help.

Post #: 1

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RE: Need to authenticate twice for OWA access - 21.Jan.2008 9:58:39 AM

Rotorblade

Posts: 973
Joined: 27.Feb.2007
Status: offline

Hi,

Using Basic authentication you're going to have issues. OWA 07 on the CAS requires Integrated Windows Authentication, Please read:

http://blogs.isaserver.org/shinder/2007/06/04/authentication-delegation-when-publishing-exchange-2007-web-client-access-watch-out-for-these-gotchas/

HTH

RB

_____________________________

David Melvin
Ohio
MCSE: Security 2003, MCSA:Security 2003

(in reply to birdy)

Post #: 2

RE: Need to authenticate twice for OWA access - 21.Feb.2008 11:28:27 AM

napoleon1815

Posts: 3
Joined: 24.Dec.2007
Status: offline

Are you running any third-party tools that hook into OWA? We had a tool that added password change links to the OWA site. Turns out it was causing dual logins.

(in reply to Rotorblade)

Post #: 3