Ipad 2 facetime and Imessage didnt work after updated to IOS 7.

Hi everyone,my problem is my Ipad 2 facetime and Imessage didnt work after updated to IOS 7. When i try to login ,it's keep saying

"facetime activation could not sign in please check your network connection" or

"fImessage activation could not sign in please check your network connection"

so,i reset everything and reset my network too,but nothing change.

BUT,when i connect my ipad 2 with my iphone using ad-hoc,the facetime and Imessage worked really good,just like normal.

And my iphone using Optus network.,So when i connect like that,my iphone using 3G and share ad-hoc to my ipad and everything work fine.

SO,anyone having idea of how to fix this problem,please,help me. And thanks alot for your time .I just want everything working normally just like before i update to IOS 7.

NOTE : before i update my ipad and my iphone,everything worked fine with my wireless router. It's just happen to my ipad since the update.

Thanks alot for your time ,any idea will be very helpful to me at this time. Again,thanks for you help .