Apple products not connecting to the internet

I have an Airport express and has been working fine up until recently. Now none of my Apple devices are connecting to the web. They all find the network no problem and all connect however they will not connect to the internet. The strange thing is that my Roku player and Kindle Fire work fine but absolutly nothing from Apple, this includes a 2011 MacBook pro, iphone 5, and an iPad Mini. I have reset the airport by unplugging it and then plugging it back in. I have asked my devices to "forget" the network and then reentered the password....Nothing is working..... Any advice would be great.