Here’s how to fix in iOS 11 Cannot connect to App Store error issue on your iPhone, iPad or iPod touch device.
Apple’s iOS 11 platform is progressing very nicely. So much so that it feels as though it’s ready for a Golden Master seed to be released in the coming days or weeks.
As is usually the case where error messages are concerned, it is actually possible to get around this niggling issue with a slight hack until Apple puts a more permanent and robust fix in place.
Without further ado, we are going to jump right in and take a look at exactly how to go about doing this.
Step 2: Exit out of the App Store and launch the Settings app.
Select General > Date & Time and then make sure that Set Automatically is turned OFF.
Step 3: You now have access to manually change the date and time. Change the date so that it shows exactly the same as the date highlighted in the Today section of the App Store.
Step 4: Launch the App Store and leave it on-screen for approximately thirty-seconds.
You can now head back into Settings and re-enable the Set Automatically feature to ensure that the device automatically pulls in the current date and time.
Step 5: Double tap the Home button to invoke the App Switcher, and swipe up on the App Store to kill it from the background. Relaunch the App Store from the Home screen as per normal process.
You will now see that everything works as expected without any error messages being produced.
source: redmondpie.com