Troubleshooting Tip: Unable to delete a tunnel int...

jangelis · 12-19-2025

Description This article describes a possible issue when IS-IS adjacency is not formed between FortiGate and Cisco. This issue might manifest when jumbo frames are enabled on the interface used for IS-IS. Scope FortiOS. Solution In case the jumbo fra...

jangelis · 12-19-2025

Description This article describes a possible issue when healthcheck is configured for a Virtual server load-balancing type, where real servers are on the same IP address. Scope FortiOS. Solution When the Virtual server is configured with real server...

jangelis · 08-29-2025

Description This article describes how to list users who passed the warning message for a FortiGuard category and describes a command to clear the table. Scope FortiGate, WebFilter. Solution Here is a sample of the configuration of a Webfilter profil...

jangelis · 08-20-2024

Description This article describes how to run some 'diagnostic test application' commands as a read-only administrator. Scope FortiGate. Solution Sometimes the admin has only read-only access to the FortiGate, but to be able to troubleshoot some issu...

jangelis · 08-06-2024

Description This article describes the case of BGP default route advertisement with as-path prepending. Scope FortiOS. Solution There are two links between FortiGates. A default route should be advertised from FGT2 to FGT1 via BGP and one link should...

jangelis · 02-28-2022

Hello Thomas,If I am correct the 172.16.20.x is the network configured on the internal interface, right?FortiGate listens on some wan interface with another IP, correct?And you are trying to connect to this wan IP (which is represented by VPN..com) w...

jangelis · 02-27-2022

Hell Thomas,I am not sure I correctly understand the desired topology.Could you please attach a network diagram with IP addresses and connections, to get the idea?Thanks,Jakub

jangelis · 02-21-2022

Hi,what model on which FortiOS? 

jangelis · 02-16-2022

o.k. I see that is basically the default.However in this case, if the wifi users get IPs from 192.168.68.0/24, then this WiFi-AP must do the NAT and translate the traffic to 192.168.1.x, and this ingresses port1 on FortiGate, correct?If this is so, t...

jangelis · 02-16-2022

Hello,is it possible to share the output of this command:diagnose ip address listto better understand the topology?Jakub

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Technical Tip: Solving IS-IS FortiGate to Cisco adjacency issue when jumbo frames are used

Technical Tip: Server Load-Balancing issue when using healthcheck with realservers using the same IP address

Techical Tip: List users that passed the warning for a FortiGuard webfilter category

Technical Tip: Running the 'diagnose test application' command as a read-only administrator

Technical Tip: BGP default route advertisement with as-path prepending

Re: FortiGate SSL-VPN

Re: FortiGate SSL-VPN

Re: FortiGate Does not show the Hardware switch option in GUI

Re: Static Routes on ForiGate 80F

Re: Static Routes on ForiGate 80F

Troubleshooting Tip: Unable to delete a tunnel int...

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Technical Tip: Forwarding IP broadcast to a differ...

Re: Admin Gui login with SSL-VPN

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