Some of us may have problem to access Check Point main portal and UserCenter site since yesterday. As The Register reports, this has nothing to do with an attack. It was a registration issue.
For those who cannot make it work yet (mine is back to normal):
You can try to work this around by some means:
1. Try IPv6, that works for the main portal
2. Use www.checkpoint.com instead of just checkpoint.com
3. Access Check Point portal by its external IP address: http://188.8.131.52/
https://usercenter.checkpoint.com is not available though.
To access it use https://184.108.40.206 or https://supportcenter.checkpoint.com