NAB customers have been unable to use the bank's online services due to a major outage on Monday.

The bank confirmed the technical problems in a message on its website.

"Some of our services are currently down. We're working hard to get them back up and running," the bank said.

"We're sorry for the inconvenience this may be causing and we're working to fix it as soon as possible. Please check back for further updates as they become available."

The bank elaborated on the scope of the tech breakdown in a pair of tweets, confirming EFTPOS machines were affected as well.

"We're currently experiencing login errors with the NAB Mobile Banking app and Desktop Internet Banking," NAB tweeted.

"We're working to fix this as soon as possible. We're sorry for the inconvenience.

"NAB merchant terminals and NAB Trade are also unavailable but ATMs, NAB cards and Apple Pay are still available. We're really sorry for the impact this is having. We know this is not how anyone wants to start their Monday and we're working to fix it as soon as possible."

Some NAB customers used Twitter to let the bank know about their irritation at the outage.

"Your eftpos terminal is down as well. I'm losing customers as they don't want to use cash as a payment," one person tweeted.

Another tweeted: "I've been at Bunnings warehouse trying to pay but need to transfer money, the app and online banking are down and I've been waiting on hold for over 50 minutes and still no answer. What a fricken joke! You've lost me and my wife as customers that's for fricken sure!"


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