Domain-name registrar Joker.com acknowledged this weekend that distributed denial-of-service attacks had caused numerous problems for customers that use its domain-name service (DNS) servers to advertise the Internet addresses of their domains.

"Joker.com currently experiences massive distributed denial of service attacks against nameservers," the company said in a statement posted to its Web site. "This affects DNS resolution of Joker.com itself, and also domains which make use of Joker.com nameservers."

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