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FortiAP-321E are offline after upgrading to FortiGate under v7.4.2
The error visible under FortiGate is this one when the FAP is offline:
diagnose wireless-controller wlac -c wtp | grep last
-------------------------------WTP 1----------------------------
last failure : 8 -- Control message maximal retransmission limit reached
Consider that this FortiAP model has limited support because of EOS (End of Support Date) is 2026-06-14, and some of its capabilities are:
3x3 11ac Wave2
1.75Gbps WiFi speed
indoor AP with BLE, 1x
RJ45 GbE LAN/PoE +
1x RJ45 Console. PoE
802.3af powered
The FortiAPs that replace this model are FAP-431F / FAP-231F.
This behavior is reported because FortiOS timezone change on this version. In this case, there are two options to fix this issue:
- Reboot the FortiAP-321E when it loses connection.
- Downgrade the FortiGate to any v7.2.x.
The best recommendation to downgrade the FortiGate is by formatting it and installing the firmware version again, for more details check this :
Technical Tip: Formatting and loading FortiGate firmware image using TFTP
To have more deep details about this downgrade process, open a new case to the TAC support team, to consider some specific reasons to make a downgrade.
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