Android ICS not able to connect to wifi?

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http://androidforums.com – I recently bought a phone with Android ICS 4.0.4. I have use lan to connect to internet in my laptop. I created a ad hoc wifi network in laptop with internet sharing. I used to connect all my other devices through this connection to access internet. They all worked fine. But, not my ICS phone. The same phone is working well with wifi routers in my work place. Is this problem specific to ICS? How do I rectify it? (General)