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FortiGate 3815D USG End of Life

Understand when support ends and how to future-proof your FortiGate 3815D USG End of Life deployment.

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The FortiGate-3815D USG was deployed as a high-performance secure gateway for demanding enterprise and data center environments. As the model reached end of life, organizations should plan upgrades that address modern throughput, visibility, and automation expectations without disrupting critical services.

What this means for your organization

  • A chance to modernize your security posture and prepare for future growth.
  • Opportunity to benefit from improved performance, efficiency, and protection.
  • Align IT infrastructure with compliance, scalability, and long-term ROI.
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FortiGate-3815D-USG Date & Status

Here’s what you need to know about FortiGate-3815D-USG lifecycle status.

  • End of Life (EOL): 1/14/26
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FortiGate-3815D-USG Replacement

Replacing the FortiGate-3815D-USG enables large aggregation points to inspect encrypted flows, segment microservices, and support remote access at scale.

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Role of the FortiGate-3815D-USG:

A high-throughput appliance for large enterprises and data center edges.

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Evolving Traffic Patterns:

Encrypted app flows, microservices traffic, and large-scale remote access strain legacy inspection engines.

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Modern Demands:

Line-rate TLS, advanced analytics, scalable segmentation, and multi-cloud connectivity.

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Strategic Upgrade:

Adopt platforms with high inspection headroom, cloud integration, orchestration, and staged migration workflows.

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Understanding Fortinet's EOL Policy | End of Life Risks

Every Fortinet product follows a defined lifecycle, moving through the following stages:

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  • General Availability (GA): The product is released and actively sold and supported.
  • End of Sale (EOS): The device is no longer available for purchase from Fortinet or authorized partners.
  • End of Life (EOL): Feature development and most firmware updates stop.
  • End of Support (EOSL): Fortinet ends all official support, security patches, and RMA services.

Why This Matters for Your Business

Understanding where your hardware sits in this lifecycle helps you:

  • Plan timely upgrades before critical support ends.
  • Ensure security compliance and avoid audit failures.
  • Maintain operational continuity with fully supported hardware.
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Risks of Continuing to Use EOL Hardware

When a firewall or security appliance reaches End of Life, the risks of keeping it in production increase dramatically

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No Security Patches

Outdated devices won’t receive updates, leaving your network exposed to new vulnerabilities.

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Lack of Vendor Support

Once support ends, there’s no access to Fortinet’s technical resources or RMA services.

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Compliance Failures

Auditors may flag unsupported hardware as a violation of security and industry standards.

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Operational Instability

Legacy devices may struggle with modern workloads, encrypted traffic, and cloud integrations.

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How Aseva Helps with Fortinet EOL

Here’s how Aseva ensures a smooth and secure FortiGate lifecycle transition.

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Lifecycle Planning:

Track Fortinet GA → EOS → EOL → EOSL.

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Seamless Migration:

Dedicated engineers ensure minimal downtime.

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Future-Proof Security:

Replace with next-gen models aligned to your needs.

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Why Choose Aseva for Fortinet End of Life Support?

Choosing the right partner is critical. With Aseva, you gain a trusted advisor with deep expertise in Fortinet and broader cybersecurity lifecycle management. We help reduce risk, ensure compliance, and maximize ROI on your IT investments.

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