Connected to wifi, but no internet access?

I have 3 smart-devices; an iPhone 5c, an iPad Mini and an HTC Inspire android. The Android and the iPhone connect to wifi/internet perfectly fine but my iPad shows that I m connected to wifi with a strong signal, but won t connect to the internet. It s only with my home router, too, because I m able to get internet access from any other signal I m connected to. I ve done the basic stuff (restarted my iPad/the wifi router, reset network settings, forgot the network and reconnected, changed the DNS) and I can t think of what else could be wrong. Has anybody ever had a similar problem and could you help me with mine? Thanks in advance.

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