CNTLM issue with intranet (maybe DNS)

Posted by htorque on Server Fault See other posts from Server Fault or by htorque
Published on 2012-06-06T17:29:36Z Indexed on 2012/06/12 22:42 UTC
Read the original article Hit count: 485

Filed under:

linux

|

proxy

|

intranet

On my Linux box I need to use an ISA proxy that requires authentication to reach the internet. I therefore installed CNTLM and configured it to point to the proxy address and listen on port 4321.

I then configured my GNOME distribution to use localhost:4321 as global proxy for HTTP and HTTPS.

The result: I can connect to the internet. I can ping intranet IPs, I do receive name resolution for intranet sites, yet I cannot ping them or open any intranet site in a browser (configured to use the distributions proxy) unless I use the site's IP address.

I tried blocking the intranet IP range in the CNTLM config file without luck.

© Server Fault or respective owner

Related posts about linux

apt-get install and update fail

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I've got a problem with apt-get update and apt-get install ... commands . every time update or installing fails and errors are : Get:1 http://dl.google.com stable Release.gpg [198B] Ign http://dl.google.com/linux/chrome/deb/ stable/main Translation-en_US Get:2 http://dl… >>> More
kernel module compiling error

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
sh@ubuntu:/home/ccpp/helloworld$ make gcc-4.6 -O2 -DMODULE -D_KERNEL_ -W -Wall -Wstrict-prototypes -Wmissing-prototypes -isystem /lib/modules/`uname -r`/build/include -c -o hello-1.o hello-1.c hello-1.c:4:0: warning: "MODULE" redefined [enabled by default] <command-line>:0:0: note: this is… >>> More
Build-Essentials installation failing

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I am having trouble accessing the several critical header files that show to be a part of the build process. The "Ubuntu Software Center" shows "Build Essentials" as installed: Next I did the following two commands, which did not improve the problem: ~$ sudo apt-get install build-essential [sudo]… >>> More
Updating Debian kernel

as seen on Super User - Search for 'Super User'
I'm trying to update my Debian machine to 2.6.32-46 (which is the new stable). However, after doing apt-get update my apt-cache search linux-image shows me: linux-headers-2.6.32-5-486 - Header files for Linux 2.6.32-5-486 linux-headers-2.6.32-5-686-bigmem - Header files for Linux 2.6.32-5-686-bigmem linux-headers-2… >>> More
Serial connection over a single USB cable (Windows to linux, or linux to linux)

as seen on Server Fault - Search for 'Server Fault'
I'm helping out with a project for an embedded device that only has USB and no serial. This device is running Linux. These days, when we need to connect to a serial port on a device we typically use a USB to serial adapter (on something like a phone system or a load balancing device, etc). I would… >>> More

Related posts about proxy

DNS lookup failures while accessing my website some proxy error

as seen on Server Fault - Search for 'Server Fault'
Here is a situation until today morning,every thing has been working perfectly fine with me. From past 6 months many of my domains wer accessible as http://site1.myserver.com http://site2.myserver.com http://site3.myserver.com http://site4.myserver.com All these were Reverse Proxy configurations… >>> More
Apache2 mod_proxy to remote Tomcat7 - slow response

as seen on Server Fault - Search for 'Server Fault'
Been stuck with this one for a few days. Will try to provide as much information as possible, but please feel free to ask for extra detail. I have 2 VMs behind a NAT, 192.168.0.100 and 192.168.0.102, both running Ubuntu 11.04 x64. The first one is mapped to the exterior and is our webserver, has… >>> More
How to set a proxy for Webbrowser Control without effecting the SYSTEM/IE proxy

as seen on Stack Overflow - Search for 'Stack Overflow'
How can I set a proxy for a Webbrowser Control without setting a proxy for IE. Basically I want my application to use a certain proxy however obviously I don't want to change user's IE proxy settings. >>> More
Difference between proxy server and reverse proxy server

as seen on Stack Overflow - Search for 'Stack Overflow'
What is the difference between proxy server and reverse proxy server? >>> More
[MAJ] Transformer APACHE 2.0 en Proxy HTTP - Comment utiliser le Module Proxy d'Apache

as seen on ASP-PHP.net - Search for 'ASP-PHP.net'
Modification du script suite ? l'alerte concernant la possibilit? offerte ? n'importe qui d'utiliser le moteur APACHE comme proxy sans aucun contr?le. >>> More