Port forward with ISA 2000

Posted on 2006-03-19
Last Modified: 2013-11-16

I have an application that i needs to access one of my client computers over the network, It works like the diagram below

Client 1------- Internet ------ router--------ISA---------Client 2

The two client computers need to communicate on TCP Port 8888.

The ISA server has 2 NIC's.

I have port forwarded from the router to ISA, but cannot work out how to forward port 8888 from ISA to Client 2.

This is not an ideal situation i know, this will be changed when we upgrade our software, but until then i need to get this working. Please provide me with a step by step guide for setting this up.

Question by:gavinandrewmcmillan
    LVL 2

    Accepted Solution

    I found a lot of good ISA 2000 information at Just plug the following into google and it should be the first link:

    "ISA 2000  server publishing"

    What you are wanting to do is similar to publishing a server...only it is an application.

    After doing some research, however, I think your best bet is to configure an IP "allow filter."

    With Internet Protocol (IP) packet filters, you can intercept and either allow or block packets destined for specific computers on your corporate network. You can configure two types of static IP packet filters: allow filters and block filters.

    There is information here, with links to detailed instructions on configuring the allow filter:

    I think that between these two resources, you should be able to come up with something that works for you.

    LVL 2

    Author Comment

    Thanks for help, i will give it a go now!
    LVL 2

    Author Comment

    Well i got it working thanks to your links.

    For reference, I created a protocol for the service using port 888, TCP etc, then published the computer as a server using the protocol, then i also created a packet filter allowing incoming connections to the client computer on port 888. After this i restareted the Microsoft ISA Service Control to apply it. I then updated the client firewalls and all was good.

    Thanks for your help Usurper_ii


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