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though it knows the password, it doesnt connect and when I click on the particular wlan from the airport list it asks me for the password which I put and then I am connected to wlan.

This happens sometimes once a week or sometimes once a month. ALso I hav observed this behavior only with some wlans. for e.g. it doesnt happen at my university but happens at home.

might it be something with my home wlan router?

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This is – in my experience – only a problem with either bad reception or bad routers. OS X shows a password prompt or a timeout then. Maybe you can tell us more about the networks that fail to connect? –  slhck Apr 2 '12 at 9:20
    
Might be something to do with the wlan 'from the airport' expiring? Many of them are operated on DHCP leases which are set to expire. –  HaydnWVN Apr 2 '12 at 11:43
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