Optus firewall upgrade blocks emergency calls for 13 hours
A botched firewall upgrade stopped about 600 Triple Zero calls connecting in South Australia, Western Australia, the Northern Territory and parts of NSW; several deaths were linked to the outage.
- Service
- Optus Triple Zero
- Date
- 18 September 2025
- Cause
- Configuration change
- Duration
- 13 hours
- Status
- resolved
- Severity
- critical
- Region
- Global
- Source
- The Register ↗
Cite this
Nuffield Consulting, “Optus firewall upgrade blocks emergency calls for 13 hours”, The Daily Tech Wire outage & breach log, 18 Sep 2025. https://techwire.nuffieldconsulting.com/incidents/2025-09-18-optus-triple-zero-outage/ (retrieved 15 Nov 2026).
This entry summarises public reporting. Please also cite the original source: The Register, https://www.theregister.com/2025/09/21/optus_emergency_call_incident/.
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