What is the purpose of security posture tagging in ZTNA?

In the context of Zero Trust Network Access (ZTNA) , security posture tagging is the fundamental mechanism used to enforce compliance and security standards before granting access to protected resources.

Granular Access Control: The primary purpose of tagging is to provide granular access control . 3 Instead of relying solely on static credentials, ZTNA uses these dynamic tags to determine if a device or user meets specific security requirements at the moment of the connection request.

Compliance-Based Enforcement: Tags are assigned based on the compliance status of the endpoint. For example, the FortiSASE Endpoint Management Service (EMS) can verify if a device has an active antivirus, is running a specific OS version, or is joined to the corporate domain. 5 If the device fails any of these checks, the " Compliant " tag is removed, and access is automatically revoked.

Dynamic and Continuous Assessment: Unlike traditional VPNs that check posture only at login, ZTNA posture tagging allows for continuous assessment . If a device ' s security posture changes—for instance, if the user disables their firewall—the tag is updated in real-time across the Security Fabric, and the ZTNA policy will immediately deny further access. 8

Integration with Policies: On the FortiGate (acting as a ZTNA proxy) or within FortiSASE, these tags are used as source criteria in ZTNA policies . 9 Only traffic originating from endpoints with the required tags (e.g., " EMS-Tag: Corporate-Managed " ) is permitted to reach the protected application.