Trust a self signed ssl cert on iPhone iOS 17

In Settings->General->VPN & Device Management, tap on your certificate. Then tap on "Install" in the upper-right corner, and agree to the warning. Once you have done that, you can go to Settings->General->About->Certificate Trust Settings, and the certificate should be there, and you can tap the toggle to trust it.

I don't know why there is now this intermediate step in the VPN section. The Apple docs should be updated to mention that.

Hello sadfoot,

Thank you for reaching out in Apple Support Communities. Just to be sure, have you followed these steps:

Trust manually installed certificate profiles in iOS and iPadOS

If you manually install a profile that contains a certificate payload in iOS and iPadOS, that certificate isn't automatically trusted for SSL. Learn how to manually trust an installed certificate profile.

This article is intended for system administrators for a school, business, or other organization.

You must manually turn on trust for SSL/TLS when you install a profile that is sent to you via email or downloaded from a website.

If you want to turn on SSL/TLS trust for that certificate, go to Settings > General > About > Certificate Trust Settings. Under "Enable full trust for root certificates," turn on trust for the certificate.

Apple recommends deploying certificates via Apple Configurator or Mobile Device Management (MDM). Certificate payloads are automatically trusted for SSL when installed with Configurator, MDM, or as part of an MDM enrollment profile.

This information is outlined in this article and may help: Trust manually installed certificate profiles in iOS and iPadOS - Apple Support

If you need further assistance, you can contact Apple Support through this link here: Get Support

Kind regards.