I have as my Router attached to Telstraclear cable an Apple Airport Extreme, I have attached to this an Airport Express to act as a Wireless Range extender. I set it up using the Airport App and extended it via wireless. All is good and it can be seen in the Airport app and all lights are green. However the only device that will connect to it is an Apple Ipad no other devices I try utilise it, e.g Android Asus Nexus 7 a Toshiba Laptop and a Galaxy S3.
The connected iPad connects with excellent connectivity.
Any ideas?