1)You may be too far from the access point to access it properly. I have noticed that my PSP is unable to secure a connection and access the net properly if the signal strength is lower than 30%. In your case it may be different, but the signal needs to be sufficient to work properly.
2)Some wireless connections require special information to be filled out first to gain access. Some hotels use this; it connects to the gateway, which is then passed onto a file which asks for login information. If it isn't filled in, the computer the DNS information through that gateway and can't access the net.
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