Upstream Alert: Another patching gone wrong
A routine firewall upgrade blocked Australia’s emergency calls for over 13 hours. It’s a chilling reminder that "minor" infrastructure changes can have dramatic consequences.
Source: https://www.arnnet.com.au/article/4060616/firewall-upgrade-behind-optus-triple-zero-failure.html
What happened?
In September 2025, Australia’s Optus telecommunications network failed its most basic mission: emergency calls, the country’s 911, stopped connecting for hours.
The culprit? A firewall upgrade. But here’s the thing: Optus itself admits it…
