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FortiAuthenticator FortiAuthenticator 6.6 FortiAuthenticator 8.0 End-of-support edge devices

FortiAuthenticator 6.6 End of Support: December 11, 2026 and June 11, 2028

By Scott Bissett  ·  Published: September 30, 2026  ·  Reference guide  ·  Dates from Fortinet's product life cycle data, re-read daily.

FortiAuthenticator 6.6 has two dates that matter. End of Engineering Support is December 11, 2026: after it the 6.6 release gets critical fixes only, with no regular maintenance releases. End of Support is June 11, 2028: after it, nothing. Both are from Fortinet's product life cycle data, which we read directly. FortiAuthenticator 6.6 was released on December 11, 2023.

Why an authentication server's dates deserve attention. FortiAuthenticator is the identity piece of a Fortinet estate: RADIUS and LDAP for the FortiGates, single sign-on, two-factor tokens, and often the certificate authority that issues the device and user certificates. It sits in the path of every login. A release that no longer receives fixes is a weak point in front of everything it authenticates, and a failed upgrade on it locks people out rather than merely dropping traffic, which is why the move should be planned while 6.6 is still in regular maintenance. The appliances have their own hardware end-of-support dates; our end-of-support edge device list covers those.
Quick answer: The FortiAuthenticator 6.6 end-of-life (EOL) date is June 11, 2028. Active support ends on December 11, 2026; security fixes continue until the end-of-life date. Every FortiAuthenticator version's release and end-of-support date is on the FortiAuthenticator lifecycle page.

FortiAuthenticator releases and their dates

ReleaseReleasedEnd of Engineering SupportEnd of Support
FortiAuthenticator 8.0October 2, 2025October 2, 2028April 2, 2030
FortiAuthenticator 6.6December 11, 2023December 11, 2026June 11, 2028
FortiAuthenticator 6.5February 14, 2022February 14, 2025June 30, 2026
FortiAuthenticator 6.4August 6, 2021August 6, 2024February 6, 2026
FortiAuthenticator 6.3April 22, 2021April 22, 2024October 22, 2025
There is no FortiAuthenticator 7.x. Fortinet's product life cycle data goes from 6.6 straight to 8.0. If you are looking for a 7.0 release to step through, it does not exist: an upgrade from 6.6 is an upgrade to 8.0.
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What the two milestones mean

What to do

  1. On FortiAuthenticator 6.5 or older: past End of Support. 6.5 ended on June 30, 2026 and 6.4 on February 6, 2026. Upgrade now; the authentication server is not the place to run unsupported code.
  2. On FortiAuthenticator 6.6: regular maintenance until December 11, 2026. That is the date to plan around, not June 11, 2028: after December the release only gets critical fixes. Schedule the move to 8.0 for a window when a rollback is possible, and test the RADIUS, LDAP, SSO and certificate flows against a FortiGate before cutting over.
  3. Going to 8.0: the only supported destination. It has regular maintenance until October 2, 2028 and End of Support on April 2, 2030. Check that the appliance model can run 8.0 before booking the window; older hardware, not the software date, is what forces a replacement.
  4. Check the hardware. FortiAuthenticator appliances carry their own end-of-support dates in Fortinet's life cycle data; the model's entry and our edge device list settle whether the box outlives the software.

Frequently Asked Questions

When is FortiAuthenticator 6.6 end of support?

Fortinet's product life cycle data lists End of Support for FortiAuthenticator 6.6 as June 11, 2028. End of Engineering Support, after which the release gets critical fixes only, is December 11, 2026.

Is there a FortiAuthenticator 7.0?

No. Fortinet's product life cycle data lists no FortiAuthenticator 7.x release. The release after 6.6 is FortiAuthenticator 8.0, released October 2, 2025, so an upgrade from 6.6 goes straight to 8.0.

Is FortiAuthenticator 6.5 still supported?

No. FortiAuthenticator 6.5 reached End of Support on June 30, 2026, and 6.4 on February 6, 2026. Only 6.6 and 8.0 are still within support.

Which FortiAuthenticator version has the longest support left?

FortiAuthenticator 8.0, with End of Engineering Support on October 2, 2028 and End of Support on April 2, 2030. FortiAuthenticator 6.6 ends on June 11, 2028.

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