Route Internet traffic through Fortigate FW

ShawnO 45 Reputation points
2025-04-08T19:06:53.7433333+00:00

For testing I setup an out of the box Pay-as-you-go Fortigate firewall in Azure. I then deployed a simple VM in the Protected subnet. All I did to the VM was check the box "Enabling IP Forwarding" on the NIC. I setup 2 rules on the firewall to allow traffic in and out for the VM. I can remote into the VM and I can load the UI and login to the firewall from the VM. I cannot get any internet bound traffic to even register in the logs on the Firewall making me think that this is an Azure issue. This info seems to be accurate, it explains what gets setup out of the box. https://docs.fortinet.com/document/fortigate-public-cloud/7.4.0/azure-administration-guide/609353

I can't find even good ways to troubleshoot this, everything seems to be setup correctly.

Azure Virtual Network
Azure Virtual Network
An Azure networking service that is used to provision private networks and optionally to connect to on-premises datacenters.
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Accepted answer
  1. Praveen Bandaru 5,520 Reputation points Microsoft External Staff Moderator
    2025-04-09T17:23:04.9633333+00:00

    Hello ShawnO 

    Thank you for sharing the information.

    Please troubleshoot the connection on the source VM and check where the request is either dropped and see if the nextup IP shows the firewall IP or not.

    Also, please test the psping on the source machine, enable the captures in the firewall collect the data and analyze it. 

    Could you please let me know if you are able to ping the internet on your FortiGate console?

    In the meantime, please try to check with your FortiGate team to analyze the captures.


    Hope the above answer helps! Please let us know do you have any further queries.

    Please do consider to “up-vote” wherever the information provided helps you, this can be beneficial to other community members.

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