What happened?
Between 13:09 UTC and 18:51 UTC on 18 March 2025, a platform issue resulted in an impact to a subset of Azure customers in the East US region. Customers may have experienced intermittent connectivity loss and increased network latency sending traffic within as well as in and out of Azure’s US East Region.
At 23:21 UTC, another impact to network capacity occurred during the recovery of the underlying fiber that customers may have experienced the same intermittent connectivity loss and increased latency sending traffic within, to and from US East.
What do we know so far?
We identified multiple fiber cuts affecting a subset of datacenters in the East US region at 13:09 UTC. The fiber cut impacted capacity to those datacenters increasing the utilization for the remaining capacity serving the affected datacenters. At 13:55 UTC, we began mitigating the impact of the fiber cut by load balancing traffic and restoring some of the impacted capacity; customers should have started to see service recover starting at this time. The restoration of traffic was fully completed by 18:51 UTC and the issue was mitigated.
At 23:20 UTC, another impact was observed during the capacity repair process. This was due to a tooling failure during the recovery process that started adding traffic back into the network before the underlying capacity was ready. We are actively mitigating the current impact to ensure no further incidents occur during the recovery process.
An update will be provided in 60 minutes, or as events warrant.
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