Re: [OT] Detecting telnet?

2010-06-11 Thread Michael J Wise
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

Re: [OT] Detecting telnet?

2010-06-11 Thread Ralf Hildebrandt
* Victor Duchovni victor.ducho...@morganstanley.com: Anyway. Is there such a thing? Does anybody use such a thing? Why do you want to discriminate against telnet 25? What do i know? I don't do this nonsense :) 'm just asking Administrators of sites that want to trouble-shoot connectivity

Re: [OT] Detecting telnet?

2010-06-11 Thread N. Yaakov Ziskind
Ralf Hildebrandt wrote (on Fri, Jun 11, 2010 at 09:57:42AM +0200): 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

Re: [OT] Detecting telnet?

2010-06-11 Thread Ralf Hildebrandt
* N. Yaakov Ziskind aw...@ziskind.us: Kinda reminds me of the Donald Westlake story, which described a fine-arts painter who took to counterfeiting $20s; the Secret Service let him go with a slap on the wrist, they said, when they figured out it him hours to produce each note. :-) Exactly

Re: [OT] Detecting telnet?

2010-06-11 Thread Bryan Irvine
I vaguely remember managing an email server around 1997 and there was a checkbox to disable telnet access. IIRC it was Imail on windows NT 4, but that was a long time ago. I do remember thinking it was odd that they could discriminate, but it seemed to work - though I'm not sure how or why. -B

Re: [OT] Detecting telnet?

2010-06-11 Thread Mark Plowman
On Thu, 10 Jun 2010 23:31:49 +0200, Ralf Hildebrandt ralf.hildebra...@charite.de wrote: [...] I must admit, it sounds feasible (timing between keystrokes etc.), With respect to detection, is this relevant? http://en.wikipedia.org/wiki/Telnet#Telnet_data -- If you have an apple and I have

Re: [OT] Detecting telnet?

2010-06-10 Thread Jeroen Geilman
On 06/10/2010 11:31 PM, 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

Re: [OT] Detecting telnet?

2010-06-10 Thread Jerrale Gayle
On 6/10/2010 5:31 PM, 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

Re: [OT] Detecting telnet?

2010-06-10 Thread Reinaldo de Carvalho
On Thu, Jun 10, 2010 at 6:31 PM, Ralf Hildebrandt ralf.hildebra...@charite.de 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

Re: [OT] Detecting telnet?

2010-06-10 Thread Charles Seeger
+-- Ralf Hildebrandt wrote (Thu, 10-Jun-2010, 23:31 +0200): | | 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

Re: [OT] Detecting telnet?

2010-06-10 Thread Victor Duchovni
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.