Question

Remote Active Directory Clients on Essential Business Server

Asked by: pfarber22

I have an EBS installation where some of the clients are located outside of the main office where EBS servers are located. 2 offices are on MPLS network with 2 routers that configured to allow all traffic between 2 subnets.  The other subnet is defined within the properties of the Internal Adapter. Static routing is set up on the Security Server with the default getaway pointing to the internal interface of the router on the EBS end and the same step was done on the other end's router.
Are there any additional steps that need to be done to ensure that AD is functioning correctly?
I noticed at least 2 troubling details:
1. Port query from a computer on the other side of EBS to the Security server shows all AD ports accessible but the same query to the Management server shows many ports as filtered.
2. There is a lot of denied connections in the TMG log file from the management server to the remote computers with the error: TCP_NOT_SYN_PACKET_DROPPED on ports higher than 1041

Any help is appreciated.

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Asked On
2009-07-26 at 23:08:27ID24602040
Tags

Essential Business Server

,

TMG

Topics

Essential Business Server

,

MS Forefront-ISA

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: HayesJupePosted on 2009-07-27 at 00:10:49ID: 24949333

any traffic that traverses an interface with ISA/TMG will be scanned and evaluated. I dont really do any SBS/EBS style of work - but im guessing that all products need to be one box ?

If this is the case, i'd be simply ensuring that all the internal ranges are defined in the internal network object, and creating a rule that allows all to all for local host/internal to internal/local host

 

by: pwindellPosted on 2009-07-27 at 06:46:08ID: 24951430

It is just a bad network design that most people never know about because most "hardware firewalls" are not fully "stateful" on all interfaces and so the [way too common] bad design "still works".   ISA is fully statefuil on all interfaces and will drop the traffic because it does not see "both sides" of the converstation.  

You can't use the EBS/ISA as the LAN Router.  One of the other Routers used for the Remote Sites must be the LAN Router.  This means the Default Gateeway of the Hosts is the LAN Router,..not the EBS/ISA.

This is a well established and fully documented situation.

The Official SBS Blog : Network Behind a Network
http://blogs.technet.com/sbs/archive/2007/11/29/network-behind-a-network.aspx

Best Practices for Configuring ISA Server Networks
(http://www.microsoft.com/technet/prodtechnol/isa/2004/plan/bp_networks.mspx)
Tips and hints on configuring network objects in ISA Server, and how to
avoid "network-behind-network" misconfigurations.

 

by: pfarber22Posted on 2009-07-28 at 12:08:52ID: 24963913

The EBS does not act as a gateway for the the remote subnet, the router does.

 

by: pwindellPosted on 2009-07-28 at 13:22:42ID: 24964796

I don't mean the gateway for the remote subnet,...I mean the Default Gateway.  Note in this diagram, which should be nearly identical to your setup, that the Router (not the ISA) is the Default Gateway for the whole Main Site,...then that router (and only it) uses the ISA as a Default Gateway.

 

 

 

by: pwindellPosted on 2009-07-28 at 13:30:47ID: 24964880

One last thing,..because EBS is an "everything on one box" kind of thing,...the ISA will block traffic from the LAN (which includes all sites) destined for the EBS box.  The AD traffic should be a "given" because the ISA System Policys should already cover that,...but traffic that falls outside the realm of AD Traffic might be blocked.

In such a case each situation would use Access Rule similar to this:

From: Internal
To: LocalHost
Protocol: <whatever is required>
Users: "All Users"

 

by: pfarber22Posted on 2009-10-06 at 15:03:54ID: 31608101

no

20120131-EE-VQP-002

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