Strange Wi-Fi issue in Mountain Lion

Hello Mountain Lion Gurus/Users/All,
Just yesterday I upgraded my 2009-mid-MacBook Pro to Mountain Lion (from Lion)
I have this strange issue.
I turn on my Wi-F
Selected my home network from the list of all the networks Mac could find. (Actually this is the network I regularly use on all my devices.)
It gets connected to my home network over Wi-Fi for 6 to 7 seconds. (I am able to browse pages, as a test, in these 6 to 7 seconds).
Suddenly message pops up saying "Connection Timeout. Could not connect to network."   Where as, I am able to browse over the same network from other devices like my iPod Touch, Android :@ Device etc.
Please help me.
Chandra

Chandra,
Some people have found that setting a network location prevents this kind of problem.
In System Preferences, choose Network.  Then Edit Location, the + sign and use any name for the location.  Then select the location in the Network preferences pane.  If you haven't already, joint the wifi network.
You should also check that you haven't inadvertently messed up your settings in the advanced portion of the preferences.  While you're in there, click the button to renew your DHCP lease (in the TCP/IP tab).
Jim

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