In FortiSASE, Zero Trust Network Access (ZTNA) tags—also known as security posture tags—are used to dynamically grant or deny access based on the real-time security state of an endpoint. This mechanism ensures that only devices meeting specific compliance requirements can access protected resources or the internet.

Endpoint Analysis: The Managed Endpoints exhibit shows that while Jumpbox only has the FortiSASE-Compliant tag, the Windows-AD endpoint has been assigned both FortiSASE-Compliant and FortiSASE-Non-Compliant tags. This indicates that a security posture check on the Windows-AD device has failed, triggering a rule that applies the non-compliant tag.

Policy Evaluation: The Secure Internet Access Policy table shows two custom policies. The first policy, named Non-compliant , uses the FortiSASE-Non-Compliant tag as its source and has the action set to Deny . The second policy, Web Traffic , allows access for FortiSASE-Compliant users.

Root Cause of Outage: Because FortiSASE (powered by FortiOS) processes security policies in a top-down sequence, the " Non-compliant " policy is evaluated first. Since Windows-AD matches the source criteria for this " Deny " policy, its traffic is blocked before it can reach the " Accept " policy.

Although the exhibit shows a warning icon for the FortiClient version on Windows-AD, the direct cause of the internet outage is the explicit Deny policy triggered by the change in the device ' s security posture (the application of the Non-Compliant tag).