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yzayani
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Staff
‎10-28-2025
Last activity: Oct 28, 2025 4:15:23 PM
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Troubleshooting Tip: LACP interface flaps not detected by FortiGate when connected to Cisco Nexus (vPC)

10-28-2025
Description This article describes an issue where LACP interfaces intermittently flap on Cisco Nexus switches, but the flaps are not detected or logged by the FortiGate. Scope FortiGate. Solution The issue occurs in environments using LAG interfaces ...

Troubleshooting Tip: IKED process consuming high CPU due to DH group mismatch in IKEv1

10-24-2025
Description This article describes an issue in FortiOS v7.4 where FortiGate shows high CPU usage because the iked process gets stuck. This happens during IKEv1 VPN rekey (Phase 1 or Phase 2). The CPU stays high for hours and then goes back to normal....

Technical Tip: BGP Route selection issue when using Route Map in redistribution

09-22-2025
Description This article describes an issue in FortiOS v7.4.x where BGP route selection fails when a route-map is applied during redistribution. The problem occurs due to incorrect AD handling, causing route flapping and loss of connectivity between ...

Troubleshooting Tip: SD-WAN Integration Problem in IPSec Tunnel

09-15-2025
Description This article describes how to troubleshoot the multipoint dial-up IPsec VPN deployment issue, where FortiGate could send return traffic through the wrong tunnel instance, which might lead to asymmetric routing and dropped connections. Sco...
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