Hi Paul, Never heard of port knocking until you mentioned it here. I read a few articles on it today and I'm not clear what value this would add to the ISA firewall. Care to teach the teacher? :) Tom Thomas W Shinder, M.D. Site: www.isaserver.org <http://www.isaserver.org/> Blog: http://spaces.msn.com/members/drisa/ Book: http://tinyurl.com/3xqb7 <http://tinyurl.com/3xqb7> MVP -- ISA Firewalls **Who is John Galt?** ________________________________ From: Geldrop, Paul van [mailto:paul.van.geldrop@xxxxxxxxxxxxx] Sent: Thursday, January 19, 2006 2:08 PM To: [ISAserver.org Discussion List] Subject: RE: [isalist] RE: Open Ports True. However, with the assumption that a) you actually own the system and b) you want to use the port-knocking mechanism (therefore making it wanted code), the concept isn't bogus. My intention is to have a go at it on my testing environment, just because it'd be fun to try. :P I wouldn't dream of even mentioning the concept at a customer. As far as 'owning the machine', I can imagine you're also referring to the fact I don't 'own' the ISA server's internals. True. Combining an ISA server as back-end with, say, a UNIX machine in front with port-knocking on it, however, would solve that problem. I'm also aware there are plenty of progs available to do that for me, but, ah hell, I like playing around with code at times. ;) ________________________________ From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx] Sent: Thu 19-1-2006 20:56 To: [ISAserver.org Discussion List] Subject: [isalist] RE: Open Ports http://www.ISAserver.org The basic idea behind port-knocking is that you have installed an agent that can control your (local or remote) firewall policies. If you've accomplished the task of installing unwanted code on a machine that you don't (actually) own, you've wasting time simply dorking about with firewall policies. ------------------------------------------------------- Jim Harrison MCP(NT4, W2K), A+, Network+, PCG http://isaserver.org/Jim_Harrison/ http://isatools.org Read the help / books / articles! ------------------------------------------------------- -----Original Message----- From: Geldrop, Paul van [mailto:paul.van.geldrop@xxxxxxxxxxxxx] Sent: Thursday, January 19, 2006 11:45 To: [ISAserver.org Discussion List] Subject: RE: [isalist] RE: Open Ports Why bogus ? ________________________________ From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx] Sent: Thu 19-1-2006 20:41 To: [ISAserver.org Discussion List] Subject: [isalist] RE: Open Ports http://www.ISAserver.org Port-knocking is a bogus concept. If you can place your agent on the firewall, it's game over anyway. ------------------------------------------------------- Jim Harrison MCP(NT4, W2K), A+, Network+, PCG http://isaserver.org/Jim_Harrison/ http://isatools.org Read the help / books / articles! ------------------------------------------------------- -----Original Message----- From: Geldrop, Paul van [mailto:paul.van.geldrop@xxxxxxxxxxxxx] Sent: Thursday, January 19, 2006 11:34 To: [ISAserver.org Discussion List] Subject: RE: [isalist] RE: Open Ports Actually, the concept of port-knocking applies to this example rather beautifully.. shame it's not available for ISA 2004. Though I do plan to have a go at a script for that, just because I wanna. :P Paul http://blogs.dirteam.com/blogs/paul ________________________________ From: Alexandre Gauthier [mailto:gauthiera@xxxxxxxxxxxxxxxxx] Sent: Thu 19-1-2006 19:59 To: [ISAserver.org Discussion List] Subject: [isalist] RE: Open Ports http://www.ISAserver.org Whenever I hear GRC.com I shudder and start loosing hair. The vision of Gibson's plump moustache brings vile, unspeakable things back to rise around the taste buds on the back of my tongue. And indeed "opening a port" (haha one more kitten/isa just died)only when requested... wouldn't that be the equivalent of leaving it open? It's akin to plugging your ears shut and opening them only when the phone rings. How will you know it is ringing and that someone attempts to communicate with you? Either I misunderstood or something here is clearly illogical. -----Message d'origine----- De : Jim Harrison [mailto:Jim@xxxxxxxxxxxx] Envoyé : 19 janvier 2006 12:09 À : [ISAserver.org Discussion List] Objet : [isalist] RE: Open Ports http://www.ISAserver.org You've been to GRC.com again, haven't you? :-P Both HTTP and FTP use the TCP protocol to get where they're going. It's a basic precept of TCP communications that you can't respond to a connection request if you don't accept them. ------------------------------------------------------- Jim Harrison MCP(NT4, W2K), A+, Network+, PCG http://isaserver.org/Jim_Harrison/ http://isatools.org Read the help / books / articles! ------------------------------------------------------- -----Original Message----- From: Tom Rogers [mailto:trogers@xxxxxxxxxxxxxxxxxx] Sent: Thursday, January 19, 2006 08:59 To: [ISAserver.org Discussion List] Subject: [isalist] Open Ports Ports 80 and 21 are open statically on my ISA 2000 SP-2 server. I publish websites through ISA and a single FTP site. How do I make these ports open dynamically - only when proper access is needed? TIA, -Tom Rogers ISA Rookie All mail to and from this domain is GFI-scanned. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: gauthiera@xxxxxxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=isalist Report abuse to listadmin@xxxxxxxxxxxxx ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: paul.van.geldrop@xxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=isalist Report abuse to listadmin@xxxxxxxxxxxxx All mail to and from this domain is GFI-scanned. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: paul.van.geldrop@xxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=isalist Report abuse to listadmin@xxxxxxxxxxxxx All mail to and from this domain is GFI-scanned. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: paul.van.geldrop@xxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=isalist Report abuse to listadmin@xxxxxxxxxxxxx