Apologies for the very delayed response. Is this still an issue for you?
You can amend the trust properties on the certificate by doing the following:
Open Keychain Access and go to: System Keychains (left menu heading) > System (left menu item) > Certificates (top menu item)
Double click the applian.com certificate to open the information
Expand the 'Trust' section and set the "When using this certificate:" value to 'Always Trust'
Please let me know how you go.
From Liam @ 14 Jan 2022 13:01