Setup Self-Signed Certificate Chains with OPNsense
docs.opnsense.org › manual › how-tosOpen your browser and go to Preferences/Certificate/Authorities Import the downloaded CA. Go back to the dashboard & open System/Settings/Administration Set SSL-Certificate to use the new server certificate. Open your browser and open the OPNsense/webgui page. You should be presented with a certificate that is verified by your intermediate CA.