I'm facing a critical issue with our FortiGate 30E devices significant number of dropped packets across all LAN ports, while the WAN port continues to operate normally without any loss
Hello,
I suspect that you are hitting 729975. I would recommend to open a TAC case.
https://docs.fortinet.com/document/fortigate/6.2.16/fortios-release-notes/236526/known-issues
729975 Some FortiGate 50E models encounter reduced download speeds on LAN interfaces.
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