Joker.com currently experiences massive distributed denial of service attacks against nameservers.
This affects DNS resolution of Joker.com itself, and also domains which make use of Joker.com nameservers.
We are very sorry for this issue, but we are working hard for a permanent solution.
Thank you for your understanding,
Your Team of Joker.com
And you might figure out so far that this is why you're not able to reach OS2 World.
Got any info to share about Joker.Com or and other registers that have problem with ddos attacks, please then check this thread within the forum.