Azure’s gateway outage severed hybrid links across 18 regions — and a routine change caused it

On September 30 and October 1, 2026, Azure gateway services degraded or dropped hybrid connectivity across 18 regions for nearly six hours, two days after an Azure OpenAI incident in Sweden Central. Microsoft has tied the disruption to a gateway-management change, and the episode is a live-fire lesson in how hyperscaler control planes fail — and what to test before the next one.