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Mac doesn't list wireless network

I have come to a very weird situation, where one of a dozens of macs (combination of iMacs, MacBooks and MBPs) doesn't list company wireless network. The affected machine list other networks in the same time (the other wifi network is a same type - WPA Personal)
I tried to turn on/off Airport, restart machine several times and remove "known networks" from the Airport Advanced list.
I faced the situation after a change of shared key on the Airport Base Station. The SSID is broadcasted and I'm able to connect to the network from the mentioned iMac using Other Networks option.
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dataline
Asked:
dataline
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1 Solution
 
strungCommented:
Open the Keychain Access utility (found in /Applications/Utilities) and remove all references to the company network.
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strungCommented:
If that doesn't solve the problem, try deleting

 /Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist

and the following files is

  ~/Library/Preferences/ directory (this is the Library directory within your User folder):

    * com.apple.internetconfig.plist
    * com.apple.internetconfigpriv.plist
    * com.apple.internetconnect.plist


and also /Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist in the root of the har
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