yum update behind NTLM proxy

Please see here for the software to download for this to work and an outline of how to configure the software.

To get yum to work from behind a proxy, set up cntlm and then follwo the instructions.

you need to make sure that cntlm is started.

./etc/init.d/cntlmd start

./etc/init.d/cntlmd stop

Then edit the yum.conf file

vi /etc/yum.conf

Add the following line into the file, it is assumed that you used port 8000 when you set up cntlm in this example


For FTP and HTTS I think the lines would be



This has not been tested but I think will work.

When running yum you may get another error

GPG key retrieval failed: [Errno 4] IOError: <urlopen error (111, ‘Connection refused’)>

I found the soultion here


If the link is unavailable

vi /etc/yum.repos.d/CentOS-Base.repo or what ever flavour of Linux you have

Change the gpgcheck=1 lines to read gpgcheck=0

This seems to fix it.


2 Comments on “yum update behind NTLM proxy”

  1. francois says:

    Merci !!
    C’est la seule documentation explicite sur ce sujet que j’ai trouvé.
    Cela m’a permis de résoudre un problème d’authentification d’une Fedora auprès d’un proxy Windows (Forefront).
    Ça reste du bricolage mais ça marche.

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