The latest in a long line of computer problems to hit Australian banks has left NAB customers unable to use ATMs and point-of-sale terminals or access their account online or over the phone.
The bank issued a statement early this afternoon, local time, confirming: "We are working to correct the problem as soon as possible - we will provide more information as soon as it becomes available. We recognise and regret the inconvenience this delay may be causing customers."
In a later note it said: "Since approximately 1pm, NAB systems have been returning to full functionality so customers are able to transact as per normal. For any customers whose transactions failed during the system outage period, they will have their accounts brought up to date overnight."
Australian banks, with their old, creaking core systems, have suffered numerous technical glitches over the last two years, with NAB, CBA and WestPac customers all inconvenienced on several occasions.
Today, it was the turn of WestPac's New Zealand customers to suffer, with online and mobile services knocked out for several hours thanks to "a hardware disk issue", the bank told local press.