Not able to log in Icloud on IOS8 after upgrade.

Hi

I upgraded to IOS8 and everything is running well.

But I am not able to log in to Icloud after many attempts.

Here is list of what things i have tried to do.

Message shows " Unable to connect "

1. Reset the phone using Home button. NO Result.

2. Tried to log in through Find Friends.. No Result.

3. Tried to log in through Find My Phone.. Success.. but only for find my phone.

Please help