Question

ISA 2006 VPN connection

Asked by: clynch302

Hello all,

Once again please forgive me I am new to ISA but learning alot.....

I have an ISA 2006 Standard that I have set up for Remote client VPN access. I can configure the client to connect using MS connection wizard just fine. The only problem is that once the client connects they cannot surf the internet. They can only access internal web apps. What do I need to do to allow "split tunneling" or in other words allow the client to still be able to access the internet and internal apps at the same time?
Right no I only have one rule in my policy that allows the VPN client to connect.

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Asked On
2009-03-10 at 17:38:18ID24218323
Tags

ISA 2006

Topic

MS Forefront-ISA

Participating Experts
2
Points
500
Comments
7

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Answers

 

by: What90Posted on 2009-03-11 at 01:17:20ID: 23854784

Hello there,

Split tunneling is considered a security issue as an attacker can bounce through your VPN connection into the corporate network. Not good.

What you may consider doing is creating a rule to allow the VPN clients to have web access on the ISA. Create a rule for the VPN clients object to have HTTP and HTTPS access to the external network. This lets you monitor and secure the web sites your VPN machines are going to. It may slow down the browsing experience of the users, but in my option, is the better way to go.

Otherwise...
Should you have a very good firewall and AV on the client machines, split tunneling is enabled on the Microsoft VPN client by removing the checkmark in the VPN clients Networking Properties dialog box for the Use default gateway on remote network setting.

 

by: Raj-GTPosted on 2009-03-11 at 02:33:07ID: 23855081

VPN Clients are treated as a seperate Network Entity by ISA Server. You have to create a new firewall rule as recommended above to give VPN Clients' network access to HTTP and HTTPS.

Also make sure you have a Network Rule in place doing NAT between VPN Clients network and the Internet.

Raj

 

by: Raj-GTPosted on 2009-03-11 at 02:37:29ID: 23855112

Also make sure the Firewall Policy above is configured to allow All Users unless you have your VPN client configured to use proxy.

Raj

 

by: clynch302Posted on 2009-03-11 at 08:49:20ID: 23858720

_________________________________________________________________________________
What you may consider doing is creating a rule to allow the VPN clients to have web access on the ISA. Create a rule for the VPN clients object to have HTTP and HTTPS access to the external network. This lets you monitor and secure the web sites your VPN machines are going to. It may slow down the browsing experience of the users, but in my option, is the better way to go.
-------------------------------------------------------------------------------------------------------------------------
This is what i did and it seems to be working.
I thing that I have encountered now is that the laptop that I was using to connect with was recently on the domain. I was logging into the laptop locally and everything seemed to be fine. But when I removed the laptop from the domain I can still connect to the vpn but it will not allow me to access the internal web apps with DNS (http://webapp) I can enter the IP address but it will ask me to login again. Is there any way around that???
Here are my rules....
1 -Allow VPN Clients Full Access - Allow - All Outbound Traffic - VPN Clients - Internal - All Users
2- Allow VPN Clients Webess - Allow - HTTP,HTTPS -VPN Clients - External- All Users

Thanks again

 

by: Raj-GTPosted on 2009-03-11 at 09:23:52ID: 23859135

Unless you have the VPN client customised to use local DNS suffixe using CMAK, you have to use the FQDN to browse the internal servers while connecting through the VPN. It also sounds like your webapp is configured for intergrated authentication.

Raj

 

by: clynch302Posted on 2009-03-11 at 09:38:43ID: 23859288

It is setup for Integrated Authentication.

 

by: Raj-GTPosted on 2009-03-11 at 09:49:40ID: 23859414

You need to add the FQDN of the webapp server (or the IP in your case) to the Intranet Zone of IE to allow Integrated Authentication pass-thru. You should also modify the Intranet Zone settings to allow 'Automatic logon only in Intranet Zone' if it's not configured already.

Please refer to this KB Article below for more information on IE integrated authentication.

http://support.microsoft.com/kb/258063


Thanks,
Raj

20120131-EE-VQP-002

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