ios15 update.

iPadfaults Said:

"ios15 update.: I updated my iPad to ios15 a few days ago and now the apple server is rejecting all my requests for access via email, apps etc. My isp has checked the network and they state that there is no issue with the network. Any advice please and have others had this issue."

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Use a Computer and Ethernet:

Start with attempting an update through use of a computer. But this time, user Ethernet.  Go Here: Making Use of a Computer for Updating an iOS Device - User Tip. On the computer, you would connect it through Ethernet, going directly into your router. For a Mac (or PC) that does not have Ethernet, this would be the adapter to use: Belkin USB-C to Gigabit Ethernet Adapter - Apple

Got VPN?

Try disabling it or, temporarily deleting it from your iPad.

Re-establish your WiFi connection.

If you choose, re-download the VPN and re-enable it and see if your WiFi connection stays stable, or not.

After ANY iOS/iPadOS upgrade/update, you should ALWAYS perform a simple hard reset of your Apple mobile device.

For older iPad models with a Home button, do a simple hard reset of your iPad by holding down both the Home and sleep/wake/power button simultaneously until your iPad goes to black and restarts with Apple logo, then release the buttons.

OR

For much newer, larger screen iPad models, without a Home button, try the new simple hard reset procedure for the new 2018/2020/2021 iPad Pros and the 2020 iPad Air 4 models.

1. Press and release the volume up button.

2. Then immediately press and release the volume down button.

3. Then, press and hold the single sleep/wake/power button You will see the Slide to Power off button, but keep on holding down the power button until you see the Apple logo, then let it go.

Once you have performed all the steps, wait for a few seconds and your 2018 iPad Pro will boot up completely to the iPad Pro’s Lock screen.

Best of Luck to You!