OK lets all take stock and use some logic here and I respectfully disagree with a few of the comments generally being banded about ! And i overall am unhappy about the general forum bashing as well as people may find a hint useful even though 'you' have not.
WPA-PSK / WPA2-PSK does not require an 'authentication server' per se as @leamanc has suggested.
Pre-Shared Key (PSK) Mode
The PSK mode is designed for home or small network use where an 802.1x authentication server isn't required. WPA-PSK works by regularly changing the automatic encryption keys authenticated between computers, your server or router and other devices that connect to it. PSK dramatically improves protection over WEP, as the encryption keys change very quickly, thus preventing intruders from gathering data to break encryption and into your network.
Now lets get to Encryption.....
WPA tends to use TKIP and WPA2 uses AES encryption.
Both these methods Apple call WPA Personal or WPA2 Personal.
AES is preferred as it is more secure and recent exploits of TKIP have led to it being slowly phased out just like WEP which should not be used at all.
However WPA works with most older hardware where as WPA2 will require more modern hardware (6 year old ish)
Overall with modern Wi-FI hardware using 'n' protocol you need to ONLY use WPA2 with AES encryption to get the best speeds/throughput. But that is another story.
I do not really want to go into WPA2 Enterprise, RADIUS, 802.1X etc as this is just going to make it even more complex for people to understand and irrelevant for Home users as this used when connecting to Business/Enterprise networks.

Wifiphisher is a WiFi hacking tool that can execute speedy automated phishing attacks against Wireless/WiFi networks with the intention of discovering user and password credentials The difference with this wireless tool (compared with the others) is that it launches a Social Engineering attack which is a completely different attack vector to take when attempting to breach WiFi.

Mac OSX 10.7.5 will not connect to a WPA2 wireless router. I've tried numerous techniques for clearing preferred networks, the PSK in the Keychain, wireless settings, but the problem persists:

Wifi menu at top right -> Name of the network I'm trying to connect to -> 'Could not join... A connection timeout occurred.' - I am not prompted for a password which is very strange since I believe I've removed the password from my system.

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Wifi menu at top right -> Join other network -> Enter name of network, WPA2, and PSK -> 'No network found.'

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Disabling encryption on the router results in the Macbook being able to connect (but is obviously not an option)
I have tried several other devices, all of which are able to connect to the router without any issues. The Macbook was previously able to connect to the router but started having connection issues a while ago.

I don't know how to find more diagnostic information (if it's even available) or properly reset the configuration so that the Macbook can connect.

MacBook Air, Mac OS X (10.7.5)

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