Scott,
Until you posted this I didn't even think about Cisco IP + Firewall running
on our router. Sure enough, there was an entry like "ip inspect "name"
SMTP". Apparently, when you telnet to the Imail server, this Cisco firewall
features consider this a possible attack. Just as you said.
Thanks for flipping the light switch.
Steve Cobb, A+, MCSE
Computer Geeks
[EMAIL PROTECTED]
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-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of R. Scott Perry
Sent: Monday, August 06, 2001 2:47 PM
To: [EMAIL PROTECTED]
Subject: Re: [IMail Forum] Telnet to port 25
>Hi all. I posted some time back about an issue I was having with
telnetting
>to port 25 on my Imail server. I can telnet to it and get a normal
>response. I can even press enter and get a "502 unimplemented command"
>message. But as soon as I press any other key, I get disconnected. I'm
>using Imail 5.
Here is one possibility:
You may have a firewall or other software that is intercepting the
transaction. If E-mail can usually be received OK, but telnetting doesn't
work (displays OK, but you can't type something without something else
being displayed or disconnecting), it's likely a poorly designed program
intercepting. The problem is that the program assumes that the entire
stream will arrive in one packet ("HELO mail.example.com", for
example). When you telnet to the server, you send something like "HE",
"L", "O m", "ai"..., in separate packets. It gets the packet "HE", and
doesn't understand it, so it disconnects.
-Scott
Declude: Anti-virus, Anti-spam and Anti-hijacking solutions for
IMail. http://www.declude.com
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