Hi, I'm new to this and not very tech savvy.
How do I prevent a device from connecting to my wi-fi if they already have the wireless key.
My son foolishly gave a friend the WPA key for our home hub 3.
The error of his ways was made very clear to him.
Can I block access without changing the key and therefore having to reconnect all properly authorised devices?
No, the only way is to change the wireless key, then reconnect all the devices.
Thanks for the speedy reply.
I had a quick look around for answers before posting and feared that I was heading for an evening of reconnections.
This might work:-
You could try searching the Homehub management pages to see what devices had previously connected and if you can establish which one is your son's friend's device you could block it via Access Controls.
If you do want to allow guest acces in future, that you have control of, then purchase a separate wireless access point like the TP-Link TL-WA701ND.
You can easily change the wireless password, and even apply MAC filtering to block devices. It even has multiple SSID options as well.