NTLM Authorization Proxy Server
Last updated on 22 October 2008.
Copyright (c) 2004-2006 Darry Dixon
Copyright (c) 2001-2004 Dmitry Rozmanov
WHAT IS 'NTLM Authorization Proxy Server'?
'NTLM Authorization Proxy Server' (APS) is a proxy software
that allows you to authenticate via an MS Proxy Server using
the proprietary NTLM protocol. Since version 0.9.5 APS has an
ability to behave as a standalone proxy server and
authenticate http clients at web servers using NTLM method.
It can change arbitrary values in your client's request
header so that those requests will look like they were
created by MS IE. It is written in Python v1.5.2 language.
supports NTLM authentication via parent proxy server
(Error 407 Proxy Authentication Required);
supports NTLM authentication at web servers (Error 401
supports translation of NTLM scheme to standard "Basic"
supports the HTTPS 'CONNECT' method for transparent
tunnelling through parent proxy server;
has ability to change arbitrary values in client's
supports unlimited number of client connections;
supports connections from external hosts;
supports HTTP 1.1 persistent connections;
stores user's credentials in config file or requests
password from a console during the start time;
supports intelligent failure detection and failover
between multiple upstream proxies;
21 October 2008:Applied all pending patches to SVN trunk,
including those in the SourceForge tracker, and many from the
trunk.tar.gz straight from SVN.
27 January 2006:New bugfix version on the latest stable branch - 0.9.9.0.1 (view CHANGELOG here).
NOTICE: Please be aware that the current active maintainer for the NTLM Authorization Proxy Server is now Darryl Dixon (homepage for the interested). Please use the sourceforge project page for support and feature requests, and do not bother the original author, Dmitry Rozmanov, unless absolutely necessary.
The server had been written for wget that
could not pass through MS Proxy set up in our LAN. But then
it turned out that even browsers can use it, so I spend some
time to get it more RFC friendly and now it looks like it
works with most software that can use http/https proxies.
Even distributed Intel-United Devices
Cancer Research Project can be used with APS. Just use
HTTPS proxy in "proxy settings" of the United Devices'
software and point to your local NTLMAPS, like server -
"localhost" and port - "8080" or something that you set in
View ReadMe here.
Licensing and Pricing:
'NTLM Authorization Proxy Server' is distributed under the
GNU General Public
License which is included in this archive (see file
The above mean that 'NTLM Authorization Proxy Server' is
pretty much free. You have to pay nothing for it.
Python language interpreter version 1.5.2 or higher. See www.python.org.
Current stable version:0.9.9.0.1
Current experimental version: 0.9.9.5
There are no binary files in the distribution. Thus you can
use the software on any system that has Python, with minimal
NTLMAPS uses only standard modules from a Python distribution.
I recommend you to take the stable version. If you are adventurous
you can try the experimental version; it's usually stable enough.
SourceForge Downloads Page contains both .zip and .tar.gz formats
What's new in 0.9.9 since 0.9.8:
Resolution of several significant bugs.
Ability to specify more than one upstream proxy and have
ntlmaps automatically fail over between them.
Several new configuration items, such as the ability to
control the number of backlogged connections supported.
With NTLM to Basic translation you have only one try to
enter right credentials. If you fail then restart your
There is an issue with APS working as a standalone proxy.
It serves requests from an http-client one by one and
allows persistent connections, then it may receive
several requests in very short time to one thread, and
one of them may be to an almost dead banner site, then
all the requests made after that one will be waiting till
that "bad" connection will be closed due to timeout. So I
suggest switching off HTTP/1.1 presistent connections in
your browser when you are using APS for web (not proxy)
authentication and surfing banner rich evironment.
There are two options in server.cfg DEBUG and
BIN_DEBUG, if you have toubles with the server so
set these options to DEBUG:1 and BIN_DEBUG:1
just before requesting a problem page (or resource). You
have to restart proxy server to reread server.cfg.
This will give you 3 log files per http request (per
connection to be exact), like 127.0.0.1-1048,
127.0.0.1-1048.bin.rserver. In the first one there
is an info on what APS did, two others contain raw traffic
from client and from proxy.
Pack them with zip or gzip and send them to me if you want
me to help you.
Authentication Scheme for HTTP is the most valuable
information source on NTLM that allowed APS to be
created. The copy of this page is included in APS'
Socks via HTTP
is a program converting SOCKS requests into HTTP requests
and tunnelling them through HTTP proxies if needed. It
may be used with APS if you sit behind HTTP only MS
Proxy. It is writen in Java so it works on any system
that have Java.
Cntlm is similar to
NTLMAPS, but is written in C.
Darryl Dixon / 27 January 2006 / email@example.com
Dmitry Rozmanov / 18 May 2002 / firstname.lastname@example.org