Maintain protection on a FortiGate 1500D without disrupting the network stack. NDLE coverage extends the value of the installed firewall by keeping security services aligned with ongoing operational requirements, helping teams preserve policy enforcement, threat visibility, and service continuity across critical segments. For infrastructure teams, this matters because firewall hardware often outlives the original service window. NDLE gives you a practical path to keep a proven platform in service while avoiding unnecessary refresh cycles. That means fewer migration risks, less change management, and more time to plan the next hardware transition on your terms. This subscription is a fit for organizations that have standardized on Fortinet and need to keep the FortiGate 1500D in a supported security posture. It is especially useful where uptime, compliance, and budget discipline all matter at once. Instead of forcing a premature replacement, NDLE helps preserve the operational investment already made in the appliance.