I tried to register an account for the first time. It kept showing I can't register a new account from the same IP address. After trying several times, it worked somehow and redirected me to login screen. But I am unable to login with the new account. It says invalid username/password though I am absolutely sure it's the right username/password. In fact the game filled up those details for me after I created new account.
Edit: I am able to login after sometime. I think there is some delay between registration and account creation. May be we can login only after sometime after registering