iMessage

Good evening,

I was receiving tonight a Message on my iPad and noticed that I could not answer ...

Then I moved on to my MBP (OS X 10.8.2) and logged into Messages ... same result.

It then showed that my iMessage was not activated on the Mac.

I therefore tried to but it did not recognised neither my username nor my password.

After trying a few more times I decided to change the password.

After this went successfully, I tried to log in into Messages ... no success ...

It always shows me "Try later message".

Anybody knows why?

Can you help me?

Thanks