RE: ftps
- From: "Thomas W Shinder" <tshinder@xxxxxxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Tue, 16 Sep 2003 13:31:56 -0500
Hi Amy,
The SecureNAT client does not support secondary connections without the
aid of an application filter. If the AS/400 app supports SOCKS4, you can
use the SOCKS filter and configure the AS/400 app to use that to manage
the secondary connections.
Otherwise, the SecureNAT client just can't support the secondary
connections without a customer app filter. And the real problem with
putting secure FTP behind a firewall is the issue of how the firewall
will be able to access the encrypted information in the application
layer headers to manage the connections? There would have to be some
form of "secure FTP bridging" where the client establishes a secure link
with the firewall, the firewall decrypts the packet to read the app
layer data so that it can manage the connection, then the firewall
reencrypts the packet and forwards it to the destination. A very large
PIA, and typical of EDS :-)
I'd like to see the swiss cheeze filters configured on the pix to allow
this to work. I suspect the entire range of ephemeral ports must be
opened. But I'd be glad to be educated if there was actually a secure
way to configure a pix to allow this.
I hope the app supports SOCKS 4, that should solve all your problems.
HTH<
Tom
Thomas W Shinder
www.isaserver.org/shinder
ISA Server and Beyond: http://tinyurl.com/1jq1
Configuring ISA Server: http://tinyurl.com/1llp
-----Original Message-----
From: Amy Babinchak [mailto:Amy@xxxxxxxxxxxxxxxxxxxxxxxxxx]
Sent: Tuesday, September 16, 2003 1:27 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] ftps
http://www.ISAserver.org
Let me first say that I've read the article on the isaserver.org website
on the complexities of ftp and the portion near the bottom where it
gives the gloomy news about ftps, secureNat clients and ISA server. This
is exactly where I'm at.
I have an AS400 that needs to transmit information to and from EDS and
another company using FTPS. The AS400 can't run the Firewall client so I
created a client address set for it and the appropriate protocol rule,
protocol definitions and matching packets filters for the required ports
(990, 2015, 1969 and 1970; all in and out) and I disabled the FTP
application filter and FTP packet filters that were in ISA by default so
that they wouldn't get in the way. Attempts by the as400 to connect
timeout. Not much is logged by the firewall - it shows 10.0.0.99
anonymous (this is the as400) connecting to the server in the log and
all else are dashes.
I went to all of this effort simply because in the article it isn't
clear to me why non-firewall client computer can't access ftps. Can
someone explain why not or give some advice on making it work? If I
can't come up with a workable solution with the ISA server then it is
going to be replaced by a Cisco Pix; this is the recommended hardware
from EDS. I'd hate to see that happen.
Amy
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