The National Australia Bank has apologised to customers after its second major tech glitch in just five days caused chaos for internet banking and ATM users.

The bank has confirmed the Mobile Banking App is now working again along with Desktop Internet Banking, NAB Connect, ATMs and EFTPOS.

“We will continue to monitor. Thanks so much for your patience and sorry for the inconvenience this has caused,” the NAB tweeted just after 7pm tonight.

Earlier today, the NAB said it was experiencing problems with its Mobile App, NAB Connect and internet banking.

In its first tweet to customers on social media it stated: “Our tech teams are currently investigating and we’ll update you as soon as we know more. Thanks for your patience.”

The bank then told customers it was experiencing an issue where balances were not displaying correctly across internet Banking, NAB Connect and ATMs.

“This issue has also caused an outage with our Mobile App. This is affecting all credit/debit card accounts and intermittently some other accounts,” it tweeted.

It went on to say: “This issue is not affecting incoming payments, but it will affect transfers between accounts which aren’t displaying correctly.

“EFTPOS and ATM withdrawals remain unaffected within daily limits.

“Will update again when we know more.”

The latest glitch comes after the NAB suffered a four-hour outage last Friday, where customers were unable to access internet banking options and their mobile app.

They were still able to use ATMS and EFTPOS facilities and local branch services as usual.

The bank asked customers to use telephone banking for account balances, transaction history, transfers between linked accounts, credit cards and to pay bills via BPAY.

While the NAB has been quick to respond to customers, it hasn’t stopped customers from venting on social media again.