Hi every body.I use centos 5.2 x_86 32 on a VMWare and I'm trying to update yum to download all necessary packages for rpm-build,to make rpm packages.I 'm behind a proxy server at work.I tried different solutions to get yum work.But I get the same error every time:

Loading "installonlyn" plugin
Setting up Update Process
Setting up repositories
http://repo.elastix.org/centos/5/upd...ta/repomd.xml: [Errno 4
]IOError:<urlopen error (-3, 'Temporary failure in name resolution')>
Trying other mirror.
Error: Cannot open/read repomd.xml filr or repository: elastix-beta

As I noticed i should configure ntlm somehow to make yum work.But all links refer to a phyton or perl version while I need a C version.Would you guide me to find the right one or is there a better way to get all necessary packages for building rpm packages?
tanx in advance