Australians are venting their anger and frustration at the mystery outage that took down service across a huge chunk of the internet, including the big four banks.

DownDetector has been flooded with user complaints, with people reporting they are unable to make payments.

@auspost Couldn't send parcels yesterday, your eParcel site down again today! "Service currently unavailable
This service is currently unavailable. Our staff are investigating the problem …" What is causing this??

— Neil Waddington (@NeilJWaddington) June 17, 2021

Reports of service returning have since begun to trickle in across major platforms.