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yangw
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‎10-14-2025
Last activity: Oct 15, 2025 3:08:58 AM
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Troubleshooting Tip: FortiGate 'no session matched' with rapid TCP session reuse

09-02-2025
Description This article explains how to troubleshoot a FortiGate 'no session matched' error that occurs when a client reuses the same source/destination/ports within a very short interval (for example, under 0.5 seconds), so the firewall has no acti...

Troubleshooting Tip: Virtual Server Load Balance Health Detection Shows Down on Secondary Unit in HA

09-02-2025
Description This article explains a condition where the load balance real server health detection displays 'down' on the HA secondary unit, even though the primary unit shows a correct health status. It outlines the expected behavior in HA, diagnosti...

Troubleshooting Tip: Firewall Policy Not Matching for one-arm packet flow After Upgrading from v7.2.10 to v7.2.11

08-06-2025
Description This article describes the steps to troubleshoot and resolve the issue of the firewall policy not matching for one-arm packet flow after upgrading from FortiGate v7.2.10 to v7.2.11. The issue occurs when the traffic flow does not match th...

Troubleshooting Tip: FortiGate Receiving Unsolicited DHCPv6 Multicast Packets

08-04-2025
Description This article describes the issue of a FortiGate receiving unsolicited DHCPv6 multicast packets and explains how to troubleshoot and potentially resolve this issue. The FortiGate is receiving repeated DHCPv6 solicitations from multiple lin...

Technical Tip: Workaround for high CPU usage taking by 'iked.session' daemon in v7.6.1

02-17-2025
Description This article provides a workaround to resolve the 'iked.session takes CPU usage 99%' in v7.6.1 and v7.6.2. Scope FortiGate, v7.6.1 and v7.6.2 Solution Verify the true cause: NTP servers configured over IPsec (set ntpsync enable) are causi...
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