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well i opened that url http://mirrorlist.centos.org as you said but it didnt return any error and opened easily and ya i did yum clean all and then yum check-update after that but i still got the same thing...
well can you please tell me what is the use of "yum --disableplugin=fastestmirror check-update -d6" command?because i have totry it on a live server and cant use it unless i'm very sure about what the command really does....please don't mind...
and i didnt understand what you meant by http proxy and all that...can you please elaborate on that?
Sarah, if you're not comfortable then don't run any of the commands i've input. No harm to be paranoid.
In my LANs, no servers can access ftp, http and other ports directly (to prevent shell users or if the server is compromised) to download anything. The traffic going out is purposely not NATed or Masqueraded out.
So to allow something like yum which needs to access http, i need to export a http_proxy variable to yum so it knows to use a squid http proxy somewhere in my LANs.
If you're not using a http proxy then it's safe to ignore the suggestion as well. I'm betting it has to do with a http proxy or perhaps on the isp side.
ell my boss isn't here and cant contact him either....i think he has used http proxy as he is really concerned with the securities,if so how should i be exporting the http variable or is there a way to know if http proxy is being used??
and you also told about the isp side?what could be wrong in the isp side?
About the isp, in one of our co-los, the isp puts a transparent http proxy, was a cisco webcache or something. The cache was dirty or stale. Once we get them to remove us (routing) from the being http cached transparently, yum worked nicely since.