# Enable trusted certificate on IPhone IOS version 26.5.2

**URL:** <https://community.start9.com/t/enable-trusted-certificate-on-iphone-ios-version-26-5-2/5411>\
**Category:** StartOS Support\
**Created:** [July 25, 2026, 9:43pm UTC](https://community.start9.com/t/enable-trusted-certificate-on-iphone-ios-version-26-5-2/5411 "2026-07-25T21:43:33Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Bruce](https://community.start9.com/user_avatar/community.start9.com/bruce/32/478_2.png) [@Bruce](https://community.start9.com/u/Bruce)\
**Post date:** [July 25, 2026, 9:43pm UTC](https://community.start9.com/t/enable-trusted-certificate-on-iphone-ios-version-26-5-2/5411/1 "2026-07-25T21:43:33Z")

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The CA certificate generated by StartOS 0.4.0 installs successfully on macOS, but on iOS it is immediately rejected as ‘invalid’ during installation, so it never appears under Certificate Trust Settings. Seems that something has changed. The instructions are easy to follow, so there are no steps I missed.

Is the HTTPS certificate presented on the public IP supposed to be the same certificate used for the `.local` address, or is it a separate certificate/profile?

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**Author:** ![Bruce](https://community.start9.com/user_avatar/community.start9.com/bruce/32/478_2.png) [@Bruce](https://community.start9.com/u/Bruce)\
**Post date:** [July 25, 2026, 10:11pm UTC](https://community.start9.com/t/enable-trusted-certificate-on-iphone-ios-version-26-5-2/5411/2 "2026-07-25T22:11:24Z")

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Downloading the `*.crt` file directly with Safari and attempting to install it results in iOS rejecting it as invalid. However, if I first save the `*.crt` file to iCloud Drive and then open it from the Files app, the certificate installs successfully. After trusting it under **Settings → General → About → Certificate Trust Settings** , HTTPS works as expected.

This appears to be related to Safari’s download/install flow rather than the certificate itself.

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**Author:** ![system](https://community.start9.com/uploads/default/original/1X/2dcde8aa6ad3ce3d7873096ee4b3e5395e19a7b5.png) [@system](https://community.start9.com/u/system)\
**Post date:** [July 27, 2026, 10:12pm UTC](https://community.start9.com/t/enable-trusted-certificate-on-iphone-ios-version-26-5-2/5411/3 "2026-07-27T22:12:16Z")

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