can't download apps over wifi at home on iPhone or iPad
On both my iPhone 4S and my iPad, I can no longer download apps from the App Store on either device on the wifi at my home, although at some point, doing so on my iPad worked fine. I don't recall it ever working on the iPhone 4S, so maybe the commonality is IOS5, which I recently updated the iPad to.
However, I can download apps just fine on my iPhone over 3G, and I can download apps just fine on both my iPhone and my iPad using the wifi at my office.
Also, on both devices, I can surf the net, and I can also access the App Store itself - I just can't upgrade any existing apps, or download any new ones. When I try to do so, I get a message that says "Unable to Download Application. 'App_Name' could not be downloaded at this time." Basically, any net-dependent activity is fine, with the exception of downloading and upgrading apps, which as I'm sure you can understand, is extremely frustrating.
I have restarted the devices, restarted my modem, restarted my router, etc., to no avail. I've googled around for other people with this problem but it does not appear to be common, and I really have no idea what to do next. Any help would be appreciated.
iPhone 4S, iOS 5, Also, a first-generation iPad