Hi, This backend feature is not avaiable in 17.5.5. You can log in in GUI and follow the path: Administration > Admin Settings > Port Settings for Admin Console . Select as: Use a different Hostname and enter the correct Hostname. What is DNS server Ip address you assigning to the Guest users? Is it ISP or Local DNS server IP address? Is the same DNS configured in the Firewall and resolving the hostname with the correct Ip address of the Sophos Interface IP? If you are not sure then share your DNS IP address, Nslookup process, Guest user's IP address (NIC card screenshot) and Sophos configuration as well. We will review and confirm to you.
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