The baseline for the always-on forced-redirect malvertising guard. <b>Enforce</b> (default) permanently sandboxes ad iframes to block redirects, so no forum loses protection on upgrade (strongest, but a small share of rich-media formats may be affected). <b>Report</b> monitors and reports attacks without changing how ads render — no revenue impact, but does not block redirects. During an active attack, use <b>Under Attack Mode</b> below to enforce temporarily instead of switching this permanently. The guard's detection beacon always runs regardless of this setting.