Sophos is discontinuing the Sophos Dynamic DNS (myfirewall.co) service as of January 31, 2022. Sophos Firewall continues to support a number of other Dynamic DNS providers that customers can utilize for this service.
If you are not using Sophos as a Dynamic DNS provider (myfirewall.co) on any customer Sophos (XG) Firewalls you do not need to take any action.
If you have any customers using Sophos as a Dynamic DNS provider, it will continue to be supported until January 31 2022, but we encourage you to change their Dynamic DNS provider as soon as possible.
We are currently reaching out to affected customers by email to advise them directly.
New registrations for Sophos Dynamic DNS will no longer be available in the latest and future SFOS firmware releases as of v18 MR6 and v18.5 MR1, however third-party Dynamic DNS service providers will continue to be fully supported.
You can find more details in this Sophos Knowledgebase Article.