Airports around Australia are advising of delays after Jetstar cancelled flights on July 19 amid an unprecedented global IT outage.
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"If you're due to travel today or tomorrow, but no longer wish to travel, we're offering free moves (+7 days from date of travel) or voucher refunds", the carrier said.
After 9.30am on July 20, it said IT systems were "back up and running and the vast majority of our flights are planned to operate today as scheduled''.
"However, due to yesterday's cancellations there are some continued impacts which may affect some flights."
As IT systems are being gradually restored around Australia people are warned of knock-on effects. On July 20, Sydney and Melbourne airports advised passengers to check with individual airlines.
It comes as some of Australia's largest institutions experienced significant IT outages with computer systems around the country crashing and displaying the "blue screen of death".
The widespread global software glitch on July 19 affected banks, airlines, media outlets, supermarkets, transport and government services.
Crowd-sourced website Downdetector listed Telstra, Microsoft, McDonald's, Google, NBN, Foxtel, National Australia Bank, ABC, CBA, ANZ, and Bendigo Bank, among many others, to have experienced outages.
Just before 8pm on July 19, federal home affairs minister Clare O'Neil said the National Emergency Mechanism group was warned "given the size and nature of this incident it may take some time to resolve". It was not a cyber security issue, she said.
A spokesperson for Microsoft told ACM it was working on a resolution. "We're aware of an issue affecting Windows devices due to an update from a third-party software platform," they said.
"We anticipate a resolution is forthcoming."
The incident stemmed from IT giant Crowdstrike's software platform.
A "defect" found in an update for Windows hosts was responsible for the global tech outage, the cyber security company behind the glitch says. CrowdStrike, based in the US, said it was working with customers and offering support.
"Mac and Linux hosts are not impacted," a spokesperson said in a statement to ACM.
"This is not a security incident or cyberattack. The issue has been identified, isolated and a fix has been deployed.
"We further recommend organisations ensure they're communicating with CrowdStrike representatives through official channels."
National Cyber Security Coordinator Michelle McGuinness said on X earlier on July 19 they had identified the source of the outage.
"Our current information is this outage relates to a technical issue with a third-party software platform employed by affected companies," she wrote.
FRNSW dispatch system down
Fire and Rescue NSW's (FRNSW) dispatch system was affected on July 19 with dispatchers coordinating incident responses manually via telephone.
It said the radio network was operating as normal.
FRNSW remained operational and available to respond to any request for assistance, it said.
In an emergency, call Triple Zero 000.
CFA and FRV in Victoria also acknowledged issues stemming from the outage on July 19.
Telstra fixed, mobile network unaffected
Telstra said its services were affected by a problem with Microsoft and a software update by cybersecurity company CrowdStrike that seemed to have gone awry.
However, it said there was no effect on calls to its Triple Zero call centres or fixed and mobile network.
Supermarket checkouts non-operational
Supermarkets, including Coles and Woolworths, experienced major delays due to checkouts not working. Shoppers had been unable to enter supermarkets in some locations.
Many shops were forced to cease Friday trading when their EFTPOS stopped working.
RMIT associate professor Dr Mark Gregory said it appeared the outage was caused by a failure of systems associated with the Crowdstrike Falcon endpoint security monitoring software.
Crowdstrike is a global multi-national software solutions provider.
"The reliance on centrally managed global software solution can lead to significant security risks," he said.
Allow extra time for flights
Melbourne Airport said global technology issues had affected check-in procedures for some airlines.
A Virgin spokesperson said "Virgin Australia operations are continuing ... however some cancellations and delays are expected".
Flights to and from Australia's largest airport, Sydney, were also affected.
"A global technical outage has impacted some airline operations and terminal services," a spokesperson said on July 19.
"Flights are currently arriving and departing, however there may be some delays throughout the evening."
The airport has brought on additional staff to help passengers, it said.
Disruptions had also hit the airport in Canberra.
Regional transport links hit by delays
In Victoria, V/Line trains on the V/Line network were stopped about 4.35pm because of a radio system fault linked to a widespread computing outage, a statement said.
Trains resumed about an hour later but significant delays were expected on all lines for a number of hours.
Coaches were in place at major train stations on the network, V/Line said.
For more information visit the V/Line website or call 1800 800 007.
In NSW, trains on the Hunter line between Newcastle and Dungog/Scone and on the Southern Highlands line between Campbelltown and Moss Vale/Goulburn were affected briefly during the peak commuter time of 5.30pm on July 19.
But the services were back online quickly, a Transport for NSW spokeswoman said. There was no effect on road traffic or traffic lights, she said.
Some police services affected
The emergency number 000 is working but NSW and Victorian police systems had gone down on July 19.
Victoria Police released a statement saying it was investigating any ongoing effect of the outage. "There are some internal application systems affected by the national outage, these are not impacting our ability to dispatch or respond to incidents," it said.
A NSW SES spokesperson said the SES remained operational.
"For life threatening incidents call 000. For assistance in floods, storm and tsunami ring the NSW SES on 132500," the spokesperson said.
Services NSW affected by outage
Services NSW, which oversees car registrations and driver's licences, was also affected by the outage.
"Service NSW apologises to customers for any inconvenience," a spokesperson said.
"Teams are working to restore services as quickly as possible.
"The majority of digital transactions have not been impacted and people are encouraged to complete transactions via the Service NSW website where possible."
Transmission outages across ABC, networks
Earlier on July 19, Illawarra reporter Nick McLaren wrote on X the ABC was having "major IT issues" across the country.
"We apologise for any break in transmission or loss of regular programs."
ABC Radio National host Andy Park confirmed ABC radio was down.
ABC producer Catherine Zengerer said that a "major technology issue" is affecting the ABC right now.
"Normal RN programming (including the LNL repeat) is affected and replacement music is playing."
In Melbourne, Nine News was forced to improvise the start of its 4pm bulletin amid problems with their prepared news packages.
Sky News had similar problems with its broadcast reduced because of the outage.
Our dependence on tech 'exposed'; Y2K 'happened'
Griffith University business affairs expert Graeme Hughes said the outage showed how reliant society had become on technology.
"While the outage is not yet resolved, it highlights our heavy reliance on technology for daily activities," he said.
"With Australians making over 730 electronic transactions per year on average, our dependence on technology is more critical than ever."
Australian Microsoft regional director Troy Hunt said this "will be the largest IT outage in history". "[Affecting] not just everywhere, but everyone (nearly). This is massive."
with Australian Associated Press