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Pedro_FTNT
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‎09-17-2024
Last activity: Sep 18, 2024 8:01:05 AM
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Troubleshooting Tip: Understanding 'syn with different ISN, suspicious'

09-11-2024
Description This article describes how to understand 'syn with different ISN' means. Scope FortiGate. Solution Debug flow could be showing messages as: msg="syn with different ISN, suspicious" and msg="anti-replay check fails, drop". That means the F...

Technical Tip: How to solve the FortiGate to FortiAnalyzer connectivity issue: 'Failed to allocate memory for log queue'

08-31-2024
Description This article describes how to solve the FortiGate connectivity issue to FortiAnalyzer when debugging shows the message: 'Failed to allocate memory for log queue'. Scope FortiGate all versions. Solution In some situations, the Firewall sto...

Technical Tip: How to configure Event Handler Alerts, specifcally to Jitter SD-WAN

04-01-2024
Description This article describes how to configure Event Handler Alerts to JITTER SD-WAN. Scope FortiAnalyzer, FortiSoC, SD-WAN, Event Handler. Solution To configure Handler: Go to FortiAnalyzer -> FortiSoC -> Handlers -> Data Selector List and sele...

Technical Tip: How to validate ICMP reply package using 'validate-reply' option

04-01-2024
Description This article describes how to use 'ping-options validate-reply'. This option helps to validate ICMP reply packages and use 'adaptive-ping enable' to do a 'Fast PING'. Scope FortiGate. Solution Example to use 'validate-reply yes' and 'adap...

Technical Tip: MAC behavior using VLAN Swith

10-30-2023
Description This article describes some details about MAC behavior when 'VLAN Switch/hard-switch' is configured. Scope FortiGate. Solution Topology: 'Device_1' is directly connected to the FortiGate interface: 'port16'. 'VLAN Switch / hard-switch' co...
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