A Citrix Administrator needs to configure a Citrix Gateway virtual IP to allow incoming connections initiated exclusively from web browser sessions. Which advanced policy will accomplish this?
A.
REQ.HTTP.HEADER User-Agent NOTCONTAINS CitrixReceiver
B.
REQ.HTTP.HEADER User-Agent CONTAINS Chrome/78.0.3904.108 Safari/537.36
C.
HTTP.REQ.HEADER(“User-Agent”).CONTAINS(“Mozilla”)
D.
HTTP.REQ.HEADER(“User-Agent”).CONTAINS(“CitrixReceiver”)
Citrix Gateway (formerly NetScaler Gateway) uses advanced policy expressions to control access based on request attributes like HTTP headers.
The User-Agent header in HTTP requests identifies the client. The native Citrix Workspace app (formerly Receiver) includes "CitrixReceiver" in its User-Agent string (e.g., "CitrixReceiver/VersionInfo"), while standard web browsers (e.g., Chrome, Firefox, Safari) typically use strings like "Mozilla/5.0" followed by browser-specific details but not "CitrixReceiver".
To restrict incoming connections to only web browser sessions (excluding Citrix Workspace app clients), bind an advanced policy expression that checks for the absence of "CitrixReceiver" in the User-Agent. This can be applied to a responder policy, authentication profile, or session policy on the Gateway VIP to either allow or deny based on the match.
NotContains Cirix Receiver, means no CitrixReceiver but there is Android, iOS and so on. Specific Browser types doesn't mean ALL browsers. As a matter of fact, all browser send as user-agent Mozilla!
Mozilla/5.0 is the general token that says that the browser is Mozilla-compatible. For historical reasons, almost every browser today sends it.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent
More likely to be "A", not fully compliant with citrix options provided here https://docs.citrix.com/en-us/citrix-gateway/current-release/storefront-integration/ng-clg-session-policies-overview-con.html
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