Complete this guide to trust your server’s Root Certificate Authority (Root CA) on iOS.
Ensure you have downloaded your Root CA
Open your iCloud Downloads folder and click on the certificate. It will display a dialog box that says “Profile Downloaded.” Click Close.
Head to Settings > General > VPN & Device Management
Locate the profile under “DOWNLOADED PROFILE” and tap on it
Tap Install again
Tap Install yet again
You should see green text with a check-mark saying “Verified” under the Profile Installed dialog.
Tap Done near the top right.
Next, navigate to General > About > Certificate Trust Settings.
Under “Enable full trust for root certificates”, enable your “<custom-address> Local Root CA”.
Your certificate should now be installed and trusted: