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Last update: 2022-03-11

Add a dynamic DNS provider

Sophos Firewall supports several third-party dynamic DNS (DDNS) providers. However, you can also use the Sophos DDNS service. Sophos DDNS is provided under the terms of your subscription with no additional charges.


Sophos Firewall supports third-party DDNS providers in high-availability mode. It doesn't support Sophos DDNS in HA deployments.

To add a dynamic DNS provider, do as follows:

  1. Go to Network > Dynamic DNS and click Add.
  2. Enter the hostname you received when you registered with your DDNS service provider, using the following format:

    <accountname>.<DDNS provider>.com

    Some providers may use a different format. For example, you may need to specify the domain and subdomains for some providers and use just the domain as a sign-in name. Check with your DDNS provider. For Sophos DDNS, use the format <hostname>

  3. Select an interface. Its IP address is bound to the hostname you've specified.

  4. Select the IPv4 address of the interface.

    • Use port IP: IP address of the interface.
    • NATed public IP: Translated IP address of the interface. Use this if your firewall is behind a router and uses a private IP address.


    Sophos Firewall checks for a change in the server IP address every 5 minutes.

  5. Select the DDNS provider and the credentials. If your provider doesn't require a username, you must enter your domain for the Login name.

  6. Click Save.
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