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I am attempting to connect a new mac OSX 10.6.5 laptop to a wireless network (I am a windows expert but a mac novice). It used to connect without problem to the network when I had the security set to "64 bit wep". Now I have changed the security on my belkin router to "WPA-PSK (no server)". I have two PC's and an old mac connecting via the new security setting without problem. Now I have the problem that on the new mac, the wireless icon is indicating a good connection (5 dark bars). Also the network name has a tick next to it on the wireless drop down menu. But I can not view any websites. I can not even connect to the router by typing 192.168.2.1 into a browser address bar. Any ideas where I went wrong?

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Do you have a DHCP server on the network? What is the IP address of the Mac (ifconfig, then look for en1 in Terminal, or check the TCP/IP tab under Advanced... in Network in System Preferences)? Do the Windows machine have manually assigned IP addresses? Does your accept point have a client whitelist of some sort, e.g. for DHCP clients? Do you have enough unused DHCP addresses to be able to assign one to your Mac? –  Daniel Beck Dec 5 '10 at 20:34
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In Network Utility try to ping google.com If that fails, try to ping 8.8.8.8 If that succeeds, you need to check your DNS settings. Check System Preferences - Network - Airport - Advanced (button near bottom right of window) - DNS

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"I can not even connect to the router by typing 192.168.2.1 into a browser address bar" -- so it's not (only) a DNS issue. –  Daniel Beck Dec 6 '10 at 7:52
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