While using wget with ISA proxy server, it throws an error '407: Proxy Authentication Required'

Solution Verified - Updated

Environment

  • Red Hat Entprise Linux(RHEL)
  • Microsoft ISA Proxy with NTLM Authentication

Issue

  • While using wget with ISA proxy server, it throws below error
407: Proxy Authentication Required

Resolution

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As a workaround, a third party program called 'ntlamps' can be used. ntlmaps handles the communication and authentication with the ISA server.

  • Go to: <Content from ntlmaps.sourceforge.net is not included.http://ntlmaps.sourceforge.net/> and Scroll down to “Download.” Download the ntlmaps package and unpack it.

  • Go to ntlmaps directory and edit 'server.cfg' with following settings:

    PARENT_PROXY:
PARENT_PROXY_PORT:
NT_DOMAIN:
USER:
PASSWORD:your_nt_password

  • Start NTLMaps (as root) using below command.

    # ./main.py

    It will show port number on which NTLM authentication proxy server is listening for. Use the same port number and hostname while using wget command.

  • Configure wget to use NTLMaps

    Create a .wgetrc file in home directory and export enviornment variables which are given by ./main.py

    $ vi ~/.wgetrc
http_proxy=http://localhost:5865/
ftp_proxy=http://localhost:5865/
use_proxy=on
wait=15

  • Next, try to issue a wget of a known webpage, like www.yahoo.com:

    $ wget www.yahoo.com

Root Cause

  • Microsoft proxy servers like the ISA line default to NTLM based authentication and this is not something which is native to linux-like os.
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