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From: Michael J Wise (mjwisekapu.net)
Date: Fri Jun 11 2010 - 01:03:07 CDT
On Jun 10, 2010, at 9:19 PM, Victor Duchovni wrote:
> On Thu, Jun 10, 2010 at 11:31:49PM +0200, Ralf Hildebrandt wrote:
>> I heard that there are firewalls/security appliances that supposedly
>> can distinguish "somebody using telnet" from "a machine speaking SMTP".
>> I must admit, it sounds feasible (timing between keystrokes etc.), but
>> little useful.
>> Anyway. Is there such a thing? Does anybody use such a thing?
> Why do you want to discriminate against "telnet 25"? Administrators of
> sites that want to trouble-shoot connectivity issues with your server
> will use "telnet 25" from time to time. There is no need to block
> this, it is by far the least likely source of any significant spam
If someone IS doing it ... they have a really good reason.
And you would do WELL to make it reasonably easy for them.
I had to do it the other day to figure out what was going wrong with a certain hard to debug subsystem.
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