If I may suggest:  Try rebooting the iPad first.  If that does not work, 
go into settings/wifi and make the iPad "forget" your home network.  
After "forgetting" it, have it find it again.  At this point it should 
ask for the network key and *should* work again.  We have 4 iDevices in 
our home and all connect via WiFi.  Two of them, an iPhone and an iPod 
keep having this issue and one of the two options above always resolves it.

Eric Greenberg

On 12/7/2011 11:52 AM, [log in to unmask] wrote:
>    One difference is that the campus wireless uses a "captive portal" web
> page to log in, while at home I use an encryption key.  But the iPad
> isn't asking me for the key -- I configured it initially and it was
> working until less than two weeks ago.  IF there were a problem with the
> key, I'd hope the error message would indicate that.
>    But all I get is "Could not connect to network".  What am I forgetting
> to check?
>
> David Gillett
>
>
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