A number of banks, supermarkets and flights around the country were impacted on Friday evening by a global IT outage.
The issue was caused by a defect found in a single content update for Windows hosts, according to CrowdStrike's chief executive, which provides the 'Falcon Sensor' software.
"This is not a security incident or cyberattack," CrowdStrike's George Kurtz said.
Acting prime minister, David Seymour, said on X that officials in the country were “moving at pace to understand the potential impacts” of the global problem.
“I have not currently received any reporting to indicate these issues are related to malicious cyber security activity,” Seymour wrote.
Crowd-sourced website Downdetector had picked up on the outage which impacted banks such as ASB and Kiwibank.
Just before 9.30pm, ASB said its credit, debit and Eftpos cards were now working and it was working on fixes for other services such as online banking.
Kiwibank said its tech teams would be working through the night to resolve the issue.
Meanwhile, self-checkout machines at Woolworths supermarkets displayed what is colloquially known as the blue screen of death.
"Your PC ran into a problem and needs to restart."
Both Woolworths and Foodstuffs, which operates New World and Four Square, confirmed customers had issues paying at the checkout.
Retail NZ's chief executive Carolyn Young said: "It appears that transactions via Eftpos are completing, however contactless and credit transactions are intermittent."
"Our hope is that fast progress is made overnight to enable businesses to operate smoothly over the weekend."
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