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Using a custom imported certificate on other interfaces
05/30/2022 
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Description
This knowledge article shows how to use a custom imported certificate on other interfaces, to resolve the untrusted certificate warning.
Cause
Users directed to an interface may receive an untrusted certificate warning. This will occur for users who are directed to an interface, which is not the default LAN interface.
Resolution
Create a host A record on an internal DNS server for the Guest Interface. The following Microsoft KB shows how to do this:
https://docs.microsoft.com/en-us/windows-server/networking/technologies/ipam/add-a-dns-resource-record
Resolution for SonicOS 6.5
This release includes significant user interface changes and many new features that are different from the SonicOS 6.2 and earlier firmware. The below resolution is for customers using SonicOS 6.5 firmware.
- Under User|Settings|Web login select the option "Redirect the browser to this appliance via: Its domain name from a reverse DNS lookup of the interface IP address"
- Add the internal DNS server to the Guest DHCP scope
Resolution for SonicOS 7.X
This release includes significant user interface changes and many new features that are different from the SonicOS 6.5 and earlier firmware. The below resolution is for customers using SonicOS 7.X firmware.
- Under DeviceWeb login select the option "Redirect the browser to this appliance via: Its domain name from a reverse DNS lookup of the interface IP address"
- Under DHCP Server add the internal DNS server to the Guest DHCP scope
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