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Known update issues

FortiOS 7.6.8 build 3744: traffic dropped on SFP ports of FortiGate 1800F/1801F

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Summary

Fortinet lists a known issue in the FortiOS 7.6.8 release notes (Bug ID 1353422). After upgrading to FortiOS 7.6.8 build 3744, FortiGate 1800F and 1801F devices drop traffic on SFP ports (SFP: small form-factor pluggable, a fibre or copper transceiver slot). The issue is confirmed by the vendor and not fixed yet.

Symptoms

Traffic on SFP ports of the affected FortiGate models is dropped after the upgrade to FortiOS 7.6.8 build 3744.

Affected

  • FortiGate 1800F and 1801F
  • FortiOS 7.6.8 build 3744
  • Bug ID 1353422 (area: System)

Workaround

No workaround known.

Fix

Not fixed yet.

Recommendation

Do not upgrade FortiGate 1800F/1801F to FortiOS 7.6.8 build 3744 for now, especially if SFP ports carry production traffic. If already upgraded, check the SFP ports and follow Fortinet's release notes and support for updates.

Sources

Compiled from the sources listed and translated with AI (Claude); status and dates come from the vendor. The vendor’s statements are authoritative. Updated 1 Nov 2026, 22:03.

Where the information comes from

We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:

  • Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
  • other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
  • community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
  • targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
  • early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online

Summary and translation with AI (Claude by Anthropic) – without any data of visitors.

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