Here is a quick tip for those of you who sometimes get the error saying Cannot Connect to iTunes Store. Besides getting this annoying error message, it makes it impossible for you to either download or update applications from the App Store.
I’m not sure what the problem is but here is how to fix it:
1. SSH to /private/var/mobile/Library/Caches/com.apple.mobile.installation.plist
2. back up and delete the file
Done! You should now be able to download and update your apps.