Re: IPsec ESP_Error : Invalid ESP packet detected ...

rvijayaraj · 04-11-2025

Description This article describes the requirement of diagnostic outputs and debugs for certain issues. Scope FortiGate. Solution Logging and debugging are both essential tools for troubleshooting, but they serve different purposes. Logging records e...

rvijayaraj · 09-29-2024

Description This article provides info on how to allow EIGRP packets to traverse through the Virtual wire pair interfaces on FortiGate. Scope FortiGate Solution Virtual Wire Pair: The Virtual Wire Pair allows to configure 2 interfaces with no IP addr...

rvijayaraj · 05-31-2021

DescriptionThis article describes how to set a scheduled speed test for the SD-WAN Network Monitor.SolutionRunning a test will automatically update the interface measured-upstream-bandwidth and measured-downstream-bandwidth fields. These fields do no...

rvijayaraj · 02-08-2024

Hi Karaked, Anti-replay is a local setting for IPsec phase2. It is not negotiated between IPsec peers, meaning it does not impact the establishment of tunnels. Enable or disable Anti-Replay as follows in in IPsec phase2 configuration: # config vpn ip...

rvijayaraj · 08-08-2023

Hi, You can try editing the xml file from the forticlient settings. 1) Download Forticlient configuration backup (XML file) from FortiClient settings.2) Open the file using a text editor (e.g. NotePad++).3) Search for the IPSec tunnel name.4) The spl...

rvijayaraj · 08-07-2023

Hi , There are few configuration which needs to enabled when setting up a HA in a ipsec vpn configured firewalls as below : 1. session-pickup under HA settings config vpn ipsec phase1-interface edit (vpn-name) set ha-sync-esp-seqno enable end 2. ha-s...

rvijayaraj · 08-03-2023

Hi , We believe that you are having some questions on the packet sniffing option available on the FGT. Packet sniffing is the troubleshooting options available in FortiGate CLI to check the traffic flow by capturing packets reaching the FortiGate uni...

rvijayaraj · 08-03-2023

Hi , One of the prerequisite for adding the interfaces on to the SDWAN is there shoudn't be any references. Delete the references what you have for the vpn like firewall policies, routes, address objects etc Post removing the references you will be a...

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Troubleshooting Tip: Logs versus Debugs

Technical Tip : How to allow the EIGRP neighbourship to form when FortiGate is kept as a intermediatory devices running on Virtual Wire Pair between 2 EIGRP neighbours

Technical Tip: How to set a scheduled speed test for a SD-WAN Network Monitor