But our company's proxy give this erro:
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Loading "installonlyn" plugin
Setting up repositories
core [1/3] http://download.fedora.redhat.co ... epodata/repomd.xml: [Errno 14] HTTP Error 407: Via: 1.1 ISASVR
Proxy-Authenticate: Negotiate
Proxy-Authenticate: Kerberos
Proxy-Authenticate: NTLM
Connection: Keep-Alive
Proxy-Connection: Keep-Alive
Pragma: no-cache
Cache-Control: no-cache
Content-Type: text/html
Content-Length: 3988
Trying other mirror.
Cannot open/read repomd.xml file for repository: core
failure: repodata/repomd.xml from core: [Errno 256] No more mirrors to try.
Error: failure: repodata/repomd.xml from core: [Errno 256] No more mirrors to try.
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It seems that yum can only do simple authentication.