ISA 2006 Single NIC Reverse Proxy configuration questions

Posted on 2008-11-10
Medium Priority
Last Modified: 2012-05-05
I have a system (VMWare ESX with single virtual NIC available) with Server 2003 and ISA 2006. This client is moving this week and need to setup an inbound proxy between the internet and inside. I can set firewall rules for OWA/OMA, and two inbound ports (one for 8080 and the other 7777). Once the traffic is in the DMZ (on a Snapgear) , I need to setup the ISA to then send it to the internal IP (I can route through the firewall potentially). This needs to be done for a few ports for OMA/OWA, 8080, 7777.

An ASCII diagram:

                               INTERNET ----- Firewall ------ Internal (
                                                      DMZ (


1) Can I use the HTTP on a different port (like 8080) to pick up that traffic and forward it? I get a refused screen when I try to set it up that way.
2) If I forward the port 8080 to port 80 to the ISA, I get a Forbidden 403 with error code 12202. My rule looks fine as it is listening on the internal network, I have the hosts file setup to forward acme.com to the DMZ port.
3) Two NIC option is NOT a solution (long corporate story about needing to do this with one nic), so if this doesn't work, can you think of any way to have traffic come to the DMZ and then rerouted internally (even with just Windows routing table or something along those lines)?

Question by:kirk_lesser
1 Comment
LVL 51

Accepted Solution

Keith Alabaster earned 2000 total points
ID: 23115724
1. You can use the normal forwarding to a different internal port - yes - as part of the listeneer/publishing rule combination but naturally only for web traffic.
2. Have you included port 80 & 8080 in the allowed protocols?
3. No - you would have to do this with the external router - ie proxy traffic directed to ISA and other routed through your normal process to inside (bypassing ISA). You need two nics in ISA to do it any other way.

Featured Post

Vote for the Most Valuable Expert

It’s time to recognize experts that go above and beyond with helpful solutions and engagement on site. Choose from the top experts in the Hall of Fame or on the right rail of your favorite topic page. Look for the blue “Nominate” button on their profile to vote.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Creating an OSPF network that automatically (dynamically) reroutes network traffic over other connections to prevent network downtime.
Are you one of those front-line IT Service Desk staff fielding calls, replying to emails, all-the-while working to resolve end-user technological nightmares? I am! That's why I have put together this brief overview of tools and techniques I use in o…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question