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philjackson Level 1 (10 points)

After upgrading to Lion from 10.6.8 on my MacBook Pro (15-inch, Early 2011), I am unable to connect to the Internet after the computer wakes from sleep.  I should rephrase this - I am able to ping IP's and DNS (DNS servers are present) however none of my apps will connect (Safari, iChat, etc) -> they all indicate the Internet is unavailable.  I have two Airport Express's running 7.5.2 extending a WiFi network off an Airport Extreme running 7.5.2.  This issue is specific to waking from sleep.  Any thoughts or suggestions would be appriciated.

Mac OS X (10.7)
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