Re: blocking telnet on port 25 with ISA server
- From: "Jim Harrison" <jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 26 Mar 2003 15:04:03 -0800
Neither ISA nor any other firewall can tell the difference between SMTP and
Telnet during the initial TCP connection phase as they both use the standard
four-packet handshake.
ISA does have an SMTP filter that is available for server-published SMTP
servers and can disconnect SMTP-protocol violators.
The protocol you want to publish is called "SMTP Server".
If you can't locate that protocol, then:
1. see if the Enterprise Policies contains it
2. reinstall ISA in Firewall or Integrated mode
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://www.microsoft.com/isaserver
http://isaserver.org/Jim_Harrison
http://isatools.org
Read the help, books and articles!
----- Original Message -----
From: "Keith Alabaster" <administrator@xxxxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Wednesday, March 26, 2003 14:37
Subject: [isalist] blocking telnet on port 25 with ISA server
http://www.ISAserver.org
I've read through so many messages that I have lost the plot somewhat. Can
ISA server split TCP traffic between SMTP and Telnet? On Firewall-1 it
gives the definition inherently but I can't find it in ISA. I only want
SMTP traffic accepted on port 25 through the ISA firewall and I do not
want to use an SMTP forwarder in front of it.
Thanks
Keith
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