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Publish both OWA 2000 and 2003 through ISA - 4.Nov.2003 12:10:00 AM

yannis

Posts: 5
Joined: 3.Nov.2003
Status: offline

I have started migrating my existing Exchange 2000 installations to Exchange 2003. To do this, I have installed Exchange 2003 to a new server and moved some test mailboxes there. I use ISA 2000 to publish OWA for both internal/external users.

The problem I am facing is the following:
When I access a mailbox (as an external client) that is hosted on Exchange 2000 through OWA, I get the network logon screen, I authenticate and access OWA 2000 normally.

When I am trying to access (through the same steps) a test Exchange 2003 mailbox, I get two network logon screens:
1. the first one is for the external server (as published through ISA)
2. as soon as I successfully authenticate, a second network logon screen popups, which requests logon to the internal Exchange (2003) server.

Of course this configuration works when I connect through the internal network (since DNS can resolve the internal server) but when trying to connect as an external client, I obviously get back a DNS error.

Is there some specific configuration setting that I should change at ISA? Is it some problem at the security settings of IIS6.0 (of the Exchange 2003 server)?

Any tips are welcome. Thanks in advance!

Post #: 1

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RE: Publish both OWA 2000 and 2003 through ISA - 4.Nov.2003 1:48:00 AM

tshinder

Posts: 47659
Joined: 10.Jan.2001
From: Texas
Status: offline

Hi Yannis,

Follow the steps in the ISA Server 2000 Exchange 2000/2003 Deployment Kit. Don't get creative unless you have a good understanding of the effects of the change you're making. The steps outlined in the kit work 100% of the time if you don't makes exceptions (like try to perform SSL to HTTP bridging [Big Grin]

)

HTH,
Tom

(in reply to yannis)

Post #: 2

RE: Publish both OWA 2000 and 2003 through ISA - 5.Nov.2003 6:23:00 PM

yannis

Posts: 5
Joined: 3.Nov.2003
Status: offline

I found out that the hosts file was due to the DNS redirect.

HOWEVER:
Since I have multiple internal exchange servers, how can I make sure that each mailbox is going to be routed to the correct one? Can I have many records in the hosts file for the same address? Because when I added the record for the Exchange 2003, the Exchange 2000 users could not access their OWA.

Is there any workaround for this?

(in reply to yannis)

Post #: 3

RE: Publish both OWA 2000 and 2003 through ISA - 5.Nov.2003 8:05:00 PM

tshinder

Posts: 47659
Joined: 10.Jan.2001
From: Texas
Status: offline

Hi Yannis,

You're have to publish each one and create the appropriate DNS records to support each server.

HTH,
Tom

(in reply to yannis)

Post #: 4

RE: Publish both OWA 2000 and 2003 through ISA - 6.Nov.2003 11:50:00 AM

yannis

Posts: 5
Joined: 3.Nov.2003
Status: offline

That is,

1) create two publications in ISA (OWA 2000, OWA 2003) pointing to the respective server (at the same external URL, http://mail.myserver.com/exchange)

2) did not quite understand what you said about DNS; you mean editing the hosts file of the ISA server or the internal DSN server? (the latter correctly routes messages among the servers). Could you please explain what I should do?

thanks for your rapid feedback and support!

(in reply to yannis)

Post #: 5