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Can't Logi n For Certificate...

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Can't Logi n For Certificate... - 13.Dec.2007 4:20:37 PM   


Posts: 108
Joined: 19.Aug.2004
From: US
Status: offline
I have the following hypothetical setup:

Authenticated DMZ:
Anonymous DMZ:

The Front End Exchange Server is in the Authenticated DMZ with an address of

The ISA Firewall's Authenticated DMZ address is

The Exchange Server is on the LAN with an address of

I can PING the Front End Exchange Server from the LAN and from ISA.

When I try to go to I am prompted for a username and password.  I enter the Domain Admin username and password and nothing happens.  When I look at the logs in ISA, there are no denied connections.

Any idea what could be happening here?


Post #: 1
RE: Can't Logi n For Certificate... - 14.Dec.2007 12:43:13 PM   


Posts: 30
Joined: 5.Dec.2004
Status: offline
it appears as if you are running an enterprise certificate host on a server sitting in the dmz.  Why have you not put the Enterprise certificate server on a system on the internal network where it belongs (the Enterprise Cert server needs to be protected at all costs). 

The authentication should be going against Active directory and you probably should not be allowing the dmz server to have that many ports open between the dmz and the internal network (or you might as well take it out of the dmz).

(in reply to charlieit)
Post #: 2
RE: Can't Logi n For Certificate... - 14.Dec.2007 2:08:33 PM   


Posts: 108
Joined: 19.Aug.2004
From: US
Status: offline
You are completely correct--I made a very big security mistake putting the CA on the FE in the Authenticated DMZ (Ironically I had just caught this a few minutes before the notification popped up that you responded to my question).  I am changing that as we speak.

However, it sounds like you are thinking of "DMZ" in the OLD sense of the word.  In the old days, DMZ's were where you quarantined public servers from your internal network.  Preferrably you had no communications between the DMZ's and your network.

However, many of us have web-based applications that communicate with database servers on the LAN which need to be secure.  The best example of this is Exchange Front-End/Back-End servers.  Fortunately, ISA 2004 and especially ISA 2006 handle this very nicely.  We can now have "Authenticated DMZ's" which only allow authenticated users to securely communicate with back-end systems.  For the anonymous users, you can create a secure "Anonymous DMZ" which does not have access to your back-end network.

If you are interested, read the following ISA 2004 article which explains the whole concept:


ISA 2006 has a few cool new features that expand on this concept as well.

(in reply to Rumple)
Post #: 3

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