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Telecom says it has been hit with another broadband problem this morning - just one day after two outages left hundreds of thousands of customers without internet access.
In a tweet, Telecom described the latest outage as "intermittent issues establishing new broadband connections".
The company said it was looking into the issue with urgency and thanked customers for their patience.
It comes after Telecom said it would review its broadband system after two massive outages yesterday.
Hundreds of thousands of customers nationwide were without broadband last night after an outage about 9.45pm.
Telecom said technicians restored the affected server about 11.35pm.
Earlier yesterday, some 300,000 broadband customers - roughly two-thirds of Telecom's broadband customers - lost services after a problem arose during a software upgrade.
Telecom said the problem with parallel servers in Auckland and Christchurch meant customers' modems were failing to authenticate when trying to communicate with the server.
Many customers' internet access had reconnected automatically, but Telecom said some people would need to reboot their modems to get back up and running.
Telecom retail chief executive Chris Quin said it was urgently investigating why yesterday's issues occurred.
"We have a comprehensive review underway to ascertain how these issues can be minimised in the future and apologise unreservedly to customers for any disruption these outages caused in the interim," he said.
The outages come after about 25,000 mainly residential customers lost service lost their connections on November 30, after a fibre-optic cable failed after system upgrade work.
Telecom apologised for the inconvenience - but ruled out compensation for customers who lost productivity due to the outage.