GoDaddy, a popular Web site hosting company, said on Tuesday that its extensive service interruptions on Monday were the result of technical problems, not a cyberattack as one hacker has claimed.

Scott Wagner, the company’s interim chief executive, said failures that knocked out several million Web sites were caused by an internal network error, “not a hack.”

That explanation contradicted claims by a supporter of Anonymous, the loose confederation of rogue hackers, who said on Twitter Monday that he took down GoDaddy using a distributed denial of service attack, or DDoS attack. In a DDoS attack, hackers barrage a site with traffic until it collapses under the load.

It was the second time this month that hackers claiming affiliation with Anonymous appeared to be falsely claiming credit for hacks. “We’re starting to see a pattern of Anonymous taking credit for the media attention,” said Rob Rachwald, director of security at Imperva, a computer security firm. “There has been a lack of serious Anonymous campaigns in the last several months, and they may be trying to get back in the groove after a temporary lull.”

GoDaddy was emphatic that the failure was not caused by outsiders. “It was not a ‘hack’ and it was not a denial of service attack,” Mr. Wagner said. While he was not specific, he said “internal network events” corrupted router data tables.