Optus says "changes to routing information" after a "routine software upgrade" was behind last week's nationwide outage, affecting 10.2 million Australians and impacting 400,000 businesses.
So it turns out that the cause was indeed a rogue change they couldn't roll back as we had been speculating.
Weird that whatever this issue is didn't occur in their test environment before they deployed into Production. I wonder why that is.
This happens in my business all the time...the test FTP IP address is left in the code and shit falls apart costing us millions... They hold a PIR and then it happens again.