For those who cannot login, please try this method. My friends and I had tried it and it works.
1. Go to www.aeriagames.com
2. Login at the middle right section.
3. You will reach your profile page. At the top, backspace your link till the word user.
4. Login in again. The second time you reach your profile page, point your mouse at games and click ddtank.
5. If you reach the blue colour play now page, means it fail. Redo from step 1 again.
6. If not, you will reach the server 2 or 1 page when success.
Within 10-15 minutes, you can login (: