I have had my Air for some time now and it has worked flawlessly. However, just recently the wifi just started playing up on my home network. Here are the facts of the problem: The iPad connects to the wifi, showing a good signal in the status bar. Under Settings, the wifi connected to appears to have a valid IP address in the same range as my router. The router has the correct IP and subnet, and the DNS servers are correct for my ISP. All apps that require an internet connects (most apps it seems these days!) tell me I am not connected. I have a wifi network diagnostics app, and I am unable to ping my router. I am unable to ping my iPad from any other device on the network. A network diagnostics app on my Mac can apparently 'see' the iPad on the network and says it has he same IP as the iPad reports, but it is unable to ping the iPad. I am also unable to load the router admin page from Safari on my iPad or browse to any other device on my network in my File Browser app. My iPhone and MacBook Pro all connect flawlessly, as does my wifes iPhone and iPad. I have recently installed a WiFi Power Adapter in my kitchen where the wifi signal in my house is very poor. This is currently set up to have it's own netwrok rather than extending the main wifi network, and my iPad can connect to that system flawlessly and browse the internet. Things I have tried to no avail: Power down and restart iPad. Power down and restart router. Forget wifi network on iPad and reenter details. Reset all my network settings on the iPad. I have tried switching off the powerline wifi box and telling the iPad to forget that network. I have changed the wifi channel used by my router. Nothing is working, and I am at a complete loss. I have not changed anything on my network, bar installing the powerline extenders. Does anyone else have any bright ideas, as they would be much appreciated!