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Permit Cisco VPN Software to pass through ISA Server

Posted on 2007-12-06
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Last Modified: 2010-08-05
I have an ISA Server 2004 firewall that has been working great for about 4 years. The state has now required that we connect to their systems using the Cisco VPN Software. I have set it up but it doesn't work and I am sure it is because the ISA firewall will not permit it.

I need to know exactly what to do to allow 5 specific workstations to use the VPN software to connect to the State's system.

Thanks - DL
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Question by:DLockwood
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SteveH_UK earned 500 total points
ID: 20419393
You need to check in the Cisco client which port it is using (it is configurable) and allow it to the VPN gateway.

Also, ensure that AH and ESP IP protocols are allowed (IP 50,51), IKE (UDP 500) and NAT-T (UDP 4500).

We did this with ISA 2006.  In our case the Cisco client was expecting to use port 10000.
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Author Comment

by:DLockwood
ID: 20419459
OK - But what actual steps do I take?

It is using port 10,000, but I have NO idea where to even begin.

Thanks.
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by:SteveH_UK
SteveH_UK earned 500 total points
ID: 20419493
In ISA Management, you need to configure a new access rule.

Use the following settings:

Type:   Allow
From:   Internal Network (or a subset)
To:       IP address of VPN gateway (the remote site, e.g. vpn.company.com)
Protocols: AH, ESP, IKE, NAT-T

On the protocols page, if they don't already exist you will need to create them.

See http://www.isaserver.org/articles/IPSec_Passthrough.html for some more help with this.
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LVL 51

Expert Comment

by:Keith Alabaster
ID: 20421956
The link is for ISA2000 so the process is a little different - that said, the ports required are described in the link comprehensively. The ports you need will depend on the transport options you have selected in the VPN client.

For isa 2004/2006,
Open the ISA gui - right-=click the firewall policy then select new - access rule and follow the wizard.
When asked for the protocols, choose selected and then select from the list. if the protocol you want is not there (they ARE there though), youcan select new and create your own.

In the from box select internal and in the TO box select external - then all users.

Keith
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Author Comment

by:DLockwood
ID: 20423454
Keith, does the access rule need to permit inbound and outbound?
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Expert Comment

by:SteveH_UK
ID: 20424118
Permit outbound is required
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Expert Comment

by:Keith Alabaster
ID: 20427816
Steve is correct - outbound only needs setting up - once the connection is established (and ISA will allow this as the setup in initiated outbound and the responses will be permitted as they are response packets) then there will be a tunnel from the client to the destination and ISA will just forward the packets to and fro like a forwarder.
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Author Closing Comment

by:DLockwood
ID: 31413129
Hi Guys - It workled brilliantly. I hope you do not mind me splitting the points, but to be perfectly honest with you, I used both answers to get the job done.

Thanks again - DL!
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Expert Comment

by:Keith Alabaster
ID: 20445144
oh well...
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