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edyrmishi
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‎09-18-2025
Last activity: Sep 18, 2025 3:18:39 PM
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Technical Tip: IPsec VPN flapping, DPD/ESP (unknown SPI) errors due to HA split-brain

08-26-2025
Description This article describes a specific scenario where, due to an HA split-brain scenario, an IPsec tunnel flaps and repeated rekey/ESP SPI mismatches are noticed. Scope FortiGate HA. Solution If repeated Received ESP packets with unknown SPI e...

Technical Tip: How to safely delete Local-in Policies when SSL VPN with a Geo-Location restriction is applied

06-24-2025
Description This article describes how to safely remove local-in policies that restrict SSL VPN connections on the FortiGate to specific countries using GEO-IP address objects. It emphasizes the importance of deleting these policies in the correct or...

Technical Tip: Web GUI crashes when editing the Security Profiles containing forward slashes in FortiOS v7.4.x

05-27-2025
Description This article describes a specific issue that occurs when editing security profiles with forward slashes in their names in the FortiOS v7.4 branch. Attempting to modify such profiles via the GUI results in the entire webpage becoming unres...

Technical Tip: Limiting YouTube Bandwidth Usage and Traffic based on OS Software type in FortiGate

04-22-2025
Description This article describes how to enforce bandwidth limits specifically for YouTube traffic, based on the operating system of client devices, using FortiGate’s Traffic Shaping and Dynamic Device & OS Identification features. Scope FortiGate v...

Troubleshooting Tip: FortiGate HA Cluster upgrade failure - how to recover without traffic disruption

03-27-2025
Description This article describes how to restore the HA functionality in such a scenario without impacting traffic flow through the primary unit. When upgrading a FortiGate HA (High Availability) cluster, the secondary unit can fail during the upgra...
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