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netmon
netmon
Visitor III
August 19, 2025
Solved

No entries available in DDNS Options

  • August 19, 2025
  • 4 replies
  • 1614 views

Hi everyone!,

 

I'm currently facing a problem with DDNS associated with fortiddns.com. The service isn't updating and returns an update error. Additionally, when I attempt to edit the configuration, no servers appear as available. This started after the DNS incident. I have another FGT 100F with the same configuration and it's not experiencing the issue. Has anyone else run into this problem?


Any insights or suggestions would be appreciated.

best regards!

 

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Best answer by gstefou

Hi Netmon, 

 

First off i would suggest to not use FortiGuard servers for your DNS Resolution and enabling DNS instead of TLS on the section under your DSN Servers. 

 

For your DDNS issue, try to set this from the CLI and not the GUI.

I have seen the GUI acting very strange when setting your DDNS there. 

Here's the CLI commands you need to run on your FGT. 

 

config system ddns
edit 1
        set ddns-server FortiGuardDDNS
        set ddns-domain "YourFGTName.fortiddns.com"
        set use-public-ip enable
        set monitor-interface "wan1"
    next
end

 

 

4 replies

ozkanaltas
ozkanaltas
Valued Contributor III
August 19, 2025

Hello @netmon ,

 

I don't have experience with ddns, but I found some troubleshooting documents for ddns. Maybe these documents can solve your problem. 

 

https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-FortiGuard-DDNS-IP-update-fails/ta-p/198179

 

https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-Unable-to-access-the-FortiGate-due-to-a-DDNS/ta-p/254318

 

    funkylicious
    SuperUser
    funkylicious
    SuperUser
    August 19, 2025

    hi,

    maybe this article will help, https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-to-configure-Dynamic-DNS-FortiGate/ta-p/208780 

    "jack of all trades, master of none"
      gstefou
      gstefouAnswer
      Explorer
      August 19, 2025

      Hi Netmon, 

       

      First off i would suggest to not use FortiGuard servers for your DNS Resolution and enabling DNS instead of TLS on the section under your DSN Servers. 

       

      For your DDNS issue, try to set this from the CLI and not the GUI.

      I have seen the GUI acting very strange when setting your DDNS there. 

      Here's the CLI commands you need to run on your FGT. 

       

      config system ddns
      edit 1
              set ddns-server FortiGuardDDNS
              set ddns-domain "YourFGTName.fortiddns.com"
              set use-public-ip enable
              set monitor-interface "wan1"
          next
      end

       

       

        netmon
        netmonAuthor
        Visitor III
        August 21, 2025

        Ultimately, the solution was to enable the set use-public-ip parameter. However, I have another firewall where this step was not necessary. I still find it noteworthy that the server cannot be selected via the GUI, although configuring it through the CLI was sufficient to resolve the issue. Thank you for your responses—kind regards.

          gstefou
          gstefou
          Explorer
          August 27, 2025

          FortiGate's GUI is behaving very strangely on some features. 

          I've seen some weird stuff going on using their GUI. 

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