Intermittent DNS Resolution Failures for Wildcard Domains

Zscaler has detected an issue with its zscaler.net, zscalertwo.net, zscloud.net, zscalerthree.net Cloud. Some customers may experience intermittent DNS resolution failures on both Private Service Edge and Public Service Edge.We will continue to provide updates here as the investigation progresses. For detailed updates, please check the Service Status section in your Zscaler customer support portal (CSP). Status changes and additional details will be posted there as they become available.Latest Update - Fri, 10 Jul 2026 06:02:36 UTCZscaler continues the phased deployment of the corrective software update to address the issue. Deployment is now complete across ZS2, ZS3, and largely complete across ZSNet and ZSCloud infrastructure globally. Zscaler will provide a final update upon completion.Update - Wed, 01 Jul 2026 22:55:15 UTCZscaler has identified the cause of the issue as a software regression in a recent Service Edge software update. The regression may cause some DNS resolution requests to intermittently time out when users access domains that return larger-than-expected DNS responses. Zscaler is applying a validated mitigation across affected infrastructure and is expediting deployment of a corrective software update. We will provide further updates as additional progress is made.Update - Thu, 02 Jul 2026 22:57:26 UTCZscaler has developed a corrective software update and is deploying it in a controlled, phased manner across affected infrastructure. Initial deployment has completed across a subset of affected infrastructure, and rollout will continue across the remaining affected infrastructure. We will provide further updates as additional progress is made.Update - Sun, 05 Jul 2026 09:42:18 UTCZscaler continues the phased deployment of the corrective software update across affected infrastructure. Deployment has now completed across ZS2, Oceania, and APAC regions, with rollout continuing across the remaining affected EMEA and AMER infrastructure. We will provide further updates as additional progress is made.Update - Tue, 07 Jul 2026 08:00:34 UTCZscaler continues the phased deployment of the corrective software update to address the intermittent DNS resolution issue affecting some customers. Deployment has been completed across all ZS2 infrastructure, with significant progress made across ZSNet, ZSCloud, and ZS3. Deployment across the remaining cloud infrastructure in APAC, EMEA, and AMER is ongoing, and Zscaler will provide further updates as progress continues.Update - Fri, 10 Jul 2026 06:02:36 UTCZscaler continues the phased deployment of the corrective software update to address the issue. Deployment is now complete across ZS2, ZS3, and largely complete across ZSNet and ZSCloud infrastructure globally. Zscaler will provide a final update upon completion.