Google Translation:

Dear members,

Very recently we decided to become a private tracker, that means that no more new members are joining.
The reason for this is that we have become too big and our servers are running at their maximum.
It is the intention that you have a valid email address for the site and make sure that you do not
lose login details. The page where you can request this, again is out of order.

We hope to have informed you sufficiently.

Best regards
J***