LinuxQuestions.org
Latest LQ Deal: Linux Power User Bundle
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Security
User Name
Password
Linux - Security This forum is for all security related questions.
Questions, tips, system compromises, firewalls, etc. are all included here.

Notices


Reply
  Search this Thread
Old 02-26-2008, 12:51 AM   #1
winxandlinx
Member
 
Registered: May 2006
Posts: 141

Rep: Reputation: 15
Putty to bypass ISA


Hi Everyone


Is it possible to putty to bypass the isa Firewall


Let me tell you my network configuration first


i have internet access through only ISA server, that too with port number 80


Even i cant broswse or access internet with my gateway


only through Internet explorer i can able access the internet


So what i want is, through putty i can bypass the traffic with port 80 and then i can


able to access the other host for telnet,ping and other protocols etc ?????????????????


For example telnet yahoo.com 80 ?????????????????????????
 
Old 02-26-2008, 02:40 AM   #2
win32sux
LQ Guru
 
Registered: Jul 2003
Location: Los Angeles
Distribution: Ubuntu
Posts: 9,870

Rep: Reputation: 377Reputation: 377Reputation: 377Reputation: 377
Quote:
Originally Posted by winxandlinx View Post
Hi Everyone


Is it possible to putty to bypass the isa Firewall


Let me tell you my network configuration first


i have internet access through only ISA server, that too with port number 80


Even i cant broswse or access internet with my gateway


only through Internet explorer i can able access the internet


So what i want is, through putty i can bypass the traffic with port 80 and then i can


able to access the other host for telnet,ping and other protocols etc ?????????????????


For example telnet yahoo.com 80 ?????????????????????????
If you do a quick Google you'll see several HOWTOs explaining how to do this sort of thing. Make sure that you talk with your network administrator before doing this, though, because you might be breaking rules which could get you fired, etc. Do NOT bypass any network restrictions unless you've been given a green light from upper levels. If you explain to them why you need certain (currently restricted) tools to work you shouldn't have a problem getting authorization for this. They might even lift your restrictions so that you don't need Putty at all. Having said that, this doesn't sound like a GNU/Linux question so far, and it might be moved to General unless the discussion turns more GNU/Linux-specific.

Last edited by win32sux; 02-26-2008 at 05:19 AM.
 
Old 02-26-2008, 02:43 AM   #3
winxandlinx
Member
 
Registered: May 2006
Posts: 141

Original Poster
Rep: Reputation: 15
Even i am a network administrator

i will put trail proxy server and i will try this

Its is only for learning experience
 
Old 02-27-2008, 02:29 AM   #4
winxandlinx
Member
 
Registered: May 2006
Posts: 141

Original Poster
Rep: Reputation: 15
Hi win32sux

Basically i can able to get lot of Document by google only if

LAN to WAN 22 is open

But in my network only proxy 80 is allowed to go outside

Last edited by winxandlinx; 02-27-2008 at 02:37 AM.
 
Old 02-27-2008, 04:53 AM   #5
win32sux
LQ Guru
 
Registered: Jul 2003
Location: Los Angeles
Distribution: Ubuntu
Posts: 9,870

Rep: Reputation: 377Reputation: 377Reputation: 377Reputation: 377
Quote:
Originally Posted by winxandlinx View Post
Hi win32sux

Basically i can able to get lot of Document by google only if

LAN to WAN 22 is open

But in my network only proxy 80 is allowed to go outside
Then you'd need to make the remote SSH daemon listen on port 80.
 
Old 02-27-2008, 04:59 AM   #6
winxandlinx
Member
 
Registered: May 2006
Posts: 141

Original Poster
Rep: Reputation: 15
can you be somewhat clear please
 
Old 02-27-2008, 05:13 AM   #7
win32sux
LQ Guru
 
Registered: Jul 2003
Location: Los Angeles
Distribution: Ubuntu
Posts: 9,870

Rep: Reputation: 377Reputation: 377Reputation: 377Reputation: 377
Quote:
Originally Posted by winxandlinx View Post
can you be somewhat clear please
SSH daemons listen on port 22 by default. So if your outgoing connections are only allowed to have destination port 80 then you have a problem. In some cases, the problem can be solved by changing the port on which the remote SSH daemon is listening on to 80. BTW, it's kinda weird to only allow 80 (HTTP) and not 443 (HTTPS) don't you think?
 
Old 02-27-2008, 05:29 AM   #8
winxandlinx
Member
 
Registered: May 2006
Posts: 141

Original Poster
Rep: Reputation: 15
Hi Thanks for your reply

Even https is also allowed

So is it possible to set in putty allow through the proxy

server ???????????????
 
Old 02-27-2008, 05:38 AM   #9
jschiwal
LQ Guru
 
Registered: Aug 2001
Location: Fargo, ND
Distribution: SuSE AMD64
Posts: 15,733

Rep: Reputation: 671Reputation: 671Reputation: 671Reputation: 671Reputation: 671Reputation: 671
It sounds like only port 80 is allowed through the firewall and you also go through a web proxy. You might try looking at the proxy setting in IE and see if you need to apply these setting in Firefox.
 
Old 02-27-2008, 06:03 AM   #10
win32sux
LQ Guru
 
Registered: Jul 2003
Location: Los Angeles
Distribution: Ubuntu
Posts: 9,870

Rep: Reputation: 377Reputation: 377Reputation: 377Reputation: 377
Quote:
Originally Posted by winxandlinx View Post
Hi Thanks for your reply

Even https is also allowed

So is it possible to set in putty allow through the proxy

server ???????????????
Yes, people use SSH in situations like this all the time. There's even tools like Corkscrew and Proxytunnel which are designed to let you use SSH through a proxy. In any case, at the very least you'll have to make sure your SSH daemon is listening on an allowed port.
 
Old 02-27-2008, 07:12 AM   #11
winxandlinx
Member
 
Registered: May 2006
Posts: 141

Original Poster
Rep: Reputation: 15
Thanks for your reply atleast now i can able to reach you my need

http://i80.photobucket.com/albums/j1...untitled-1.jpg

let me try Corkscrew and Proxytunnel also

Last edited by winxandlinx; 02-27-2008 at 07:54 AM.
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
PC/104 ISA bridge VT82C686 - writing driver for self-made ISA board jpmzometa Linux - Hardware 11 08-06-2007 06:51 AM
How to bypass ISA 2000 using Linux jamshed Linux - Networking 1 02-14-2007 06:25 AM
security bypass fid def Linux - Newbie 16 08-24-2005 10:28 AM
Bypass proxy hotplainrice Linux - Networking 1 02-26-2005 07:13 AM
ISA shows up in lspci, but my mobo has no ISA slots... compjinx Linux - Hardware 7 09-10-2004 03:25 AM

LinuxQuestions.org > Forums > Linux Forums > Linux - Security

All times are GMT -5. The time now is 01:49 PM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration