i OS 8 has been recently afflicted with numerous bugs and issues, wherein a vague "Can't connect to App Store" error reportedly shows up while trying to log in to the App store.
The issue seems to persist even after restarting or resetting the affected i OS device and using a different Wi-Fi router.
Here you go: Launch i Tunes → Go to Preferences from top menu.
One of the simplest reasons why your i Phone/i Pad/i Pod Touch cannot connect to App Store is because of a network issue.
If you have been using cellular data, switch to Wi-Fi. You can visit Apple system page to check if the i Tunes Store system is down.
This page is available on Apple official website and contains information about system status of Apple Services, Stores, and i Cloud.
One way of finding out is to turn off your network and restart it.For those of you who need some assistance, check out the step-by-step guide below: Steps to fix 'Can't connect to App Store' error on i Phone or i Pad running i OS 8 Step 1: Open the Settings app, scroll down and tap on i Tunes & App Store.Step 2: Tap on your Apple ID and choose Sign Out option from the pop-up menu.When that is not the case, there are some solutions you can check out, and get rid of the issue.These are some of the error messages : “Cannot connect to the i Tunes Store.If you get the ‘Cannot Connect to i Tunes Store' error even after all these steps, may be something is stuck up hard.