Posts Tagged ‘ISA Connector’

How to configure Exchange 2007 and ISA with FBA and NTLM, without loosing ActiveSync on the way

Basicly we are here, because we want to use Forms Based Authentication (FBA) for our Outlook Web Access (OWA) users in Exchange 2007, while still using NTLM/Kerberos authentication for Outlook Anywhere (OA), wich in turn means less entering of the users password, while still not killing our ActiveSync clients since they only run Basic authentication.

Confused? let me try and make it easier.

  • We prefer FBA for OWA, it is just more nice for the user to get a webpage to login to their OWA.
  • We prefer NTLM for OA, it gives less password prompts and well it sounds safer than basic authentication
  • We still want ActiveSync with Basic, but it fails if we use NTLM on our connection as well so we need to seperate them

ISA Rules

What is the solution? Well its rather simple, we configure our services to use the authentication as we prefer, but we need to do some configuring of public DNS, Public IP’s and ISA to get all 3 authentication schemes to work at the same time. Basicly NTLM and Forms Based Authentication just does not mix. If you use FBA on a listener in ISA it will always fallback to Basic authentication if the client does not support FBA. It is not possible to use NTLM and FBA on the same ISA 2006 listener.

I have added screenshots of the important bits of the configuration in the bottom, and You should have all the required info to get it working, but You will need some basic knowledge of how to setup up Exchange 2007, ISA 2006 with Exchange 2007, etc. Read the rest of this entry »