Can not you? What should I do?

Have you seen the text?

Dear racers, our master server is currently experiencing DDoS attacks.
We are working towards a better protection, although that may take a few more days to get right.
We apologise for the inconvenience, but our services will be back in full force soon!
Your patience and support are and have always been greatly appreciated.

Update thread: https://www.lfs.net/forum/thread/92058-LFS-DDoS-Update-Thread