Posted on: Mon, 03 Nov 2025 22:47:31 UTC
Resolved on: Wed, 12 Nov 2025 20:44:06 UTC
Start Time: Wed, 05 Nov 2025 00:00:00 UTCEnd Time: Wed, 05 Nov 2025 04:00:00 UTC
Dallas I (DFW1) datacenter Scheduled Maintenance
Datacenters affected: Americas, Dallas I
Scheduled For: Wed, 05 Nov 2025 00:00:00 UTC to Wed, 05 Nov 2025 04:00:00 UTC
Status: Completed

Zscaler will perform urgent hardware replacement in Dallas I (DFW1) datacenter.
During the maintenance, traffic will failover to redundant clusters in the same datacenter.

Maintenance window,
  Start: 2025-10-05 00:00 UTC
  End: 2025-10-05 04:00 UTC
  (Local time: 2025-10-04 18:00 - 22:00 CST)
Reason of maintenance: Replace faulty hardware to prevent unexpected impacts.

Zscaler services will failover to redundant clusters in the same datacenter and expect to have minimum to none actual service impacts.

 

Update - Wed, 12 Nov 2025 20:40:35 UTC

This activity was completed as expected on 11/5 UTC and new hardware health monitored all good. Please contact Zscaler Support if you have additional questions.