Follow the instructions below to reset your iPad's network settings:
Step 1: Tap Settings.
Step 2: Tap General.
Step 3: Scroll down to the bottom of the page and tap Reset.
Step 4: Tap Reset Network Settings.
Step 5: You will get a prompt warning you that this option will delete all network settings and return them to factory default settings. Tap Reset to continue.
Step 6: Wait while your iPad resets its network settings.