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I've got a MacBook Pro, and I notice that after a while on my home WiFi network (WPA2, PSK, Belkin N+ router) that I can't surf. The airport connection appears strong, I can zip around my own local network just fine, but it appears as though I can't access external websites.

This issue doesn't occur on any of my other (Windows/Linux) machines, so it's got to be something to do with the MacBook, or so I figure. Only thing I've thought of thusfar is traceroute, which yields either really long ping times (> 1000 ms) or timeouts.

If anyone can help me diagnose this, or if they know the answer to this, it'd be muchly appreciated.

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I had a similar problem yesterday. Running Network Utilities (in /Applications/Utilities) cured the problem.

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Just running it solved it? Without doing anything inside of the application? – Eddie Parker Nov 10 '09 at 5:33
yes. Just running it. I didn't do anything inside the application. – bastibe Nov 19 '09 at 8:49

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