iPhone 3Gs WiFi problem (iOS 4.1)

[cr3ckzor]

So as the title says I have a problem with my iPhone 3Gs. I can't connect to my home WiFi. I go to options, network, wifi, and find my connection. I press to connect and it's all ok. But when I start Safari it opens the mobile Google page but when I wanna search something it pops out that I'm not connected but on the top left I have the little WiFi sign that I'm connected but it won't connect. Help me please.
I use jailbreaken 4.1 iOS btw.

EDIT: Link of the problem I recorded.

 

[tintbob]

Can other devices connect to your wifi ??

 

[cr3ckzor]

Yes. My brother connects with his Galaxy S2 without a problem.

 

[tintbob]

Can you connect to other wifi's ???
If you can, try altering the channel of your home wifi, I have seen this recently when trying to connect to a friends wifi, tried everything then read about changing channels, worked straight away....

 

[cr3ckzor]

I fixed the problem by disabling wifi security on my router. It works now smoothly! Thank you for your help anyway!