ios15.1 does not let iPad connect to the internet.
How do I get iPad to connect to the internet after upgrading to ios 15.1? It is upgraded but no longer connects to the internet.
iPad, iPadOS 15
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If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support
If you have a VPN App or profiles installed, or a security App such as Norton, these may be interfering with DHCP and preventing your device from obtaining a valid IP Address for your network. The resolution is relatively simple; may only need to temporarily disable or remove the Security App and/or VPN.
DHCP is frequently used to automatically obtain an IP Address from your WiFi Router. Until your iPad has a valid IP Address to connect to your network, you will not have an internet connection. Disabling or removing VPN and/or the offending security App should allow DHCP to operate normally - allowing connection to your network and the internet.
If this resolves your issue, the VPN and/or security App can be reinstated after the connectivity problem has been resolved.