Re: Putting MS servers behind firewalls

["Paul D. Robertson" <paul () compuwar net>]

On Mon, 7 Jun 2004, Dilan Walgampaya wrote:

>       I ran in to a problem putting Microsoft Servers behind a firewall. The
> users has to go through the FW to access the servers. The servers I
> wanted to put are on an AD domain. There were AD server, File server and
> an Exchange server. These servers need a large no. of services opened
> for proper operation. The worse is that exchange server work in a

You're trying to do two mutually incompatible things- Firewalls work by
blocking things- the more they block, the stronger they are.  Microsoft
products "work" by communicating with each other over RPC services, the
more they communicate the better they work.

> dynamic port setup where the server opens a random port for each
> different client. MS site has some registry edits that is supposed to
> correct this dynamic port setup issue. But when I tried these they did
> not work as per the document describes.
>
>       Has anybody done this kind of a setup (with other than an ISA server).
> I am interested in doing this with Netscreen/Pix and Linux IPTables. Any
> help is appreciated.

ISA server theoretically knows enough to proxy the connections- that's
your second-best bet.  Your best bet is to move everything serious behind
the firewall, and put in Citrix or Terminal server, and allow only access
to that service through the firewall.  I'd keep Exchange on the outside
though, since they you're just left with local workstation exposure to
E-mail based malcode.

Paul
-----------------------------------------------------------------------------
Paul D. Robertson      "My statements in this message are personal opinions
paul () compuwar net       which may have no basis whatsoever in fact."
probertson () trusecure com Director of Risk Assessment TruSecure Corporation
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