can't use yum

[gab_v]

I added the line about proxy in my /etc/yum.conf 
but with no result.

I also want to say that I inserted the info about the proxy in my .bash_profile as,

#yum
export http_proxy="http://:" [1]

I also inform you that if I run:
nm-tool
I got as reply :
...
NetworkManager Tool

State: disconnected

- Device: eth0 ----------------------------------------------------------------
  Type:              Wired
  Driver:            sky2
  State:             unmanaged
  HW Address:        00:00:00:00:00:00

  Capabilities:
    Supported:       yes
    Carrier Detect:  yes
    Speed:           100 Mb/s

  Wired Settings

If I understand correctly that's the proof that yum does not see my connection.
but remember...
I surf internet, services like network, ypbind, NetworkManager are running...

so what's to do?

Thank you for the quick reply


Links:
------
[1] http://<proxy_address>:<port>"


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