iOS 26: "TLS failed with error: -9808"

App & System Services Core OS
mitsubish OP
Created 9h
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Our app server is having some TLS related issue with the new iOS 26 (It works with iOS 18 and below).

When opening the domain url in iPhone Safari browser with iOS 26, it showing the error as below:

We followed the instructions from this link (https://support.apple.com/en-sg/122756), to run the following command: nscurl --tls-diagnostics https://test.example in Terminal app. It shows TLS failed with error: -9808

Could anyone please help explain what exactly the issue is with our server certificate, and how we should fix it? Thanks so much!

Replies  1
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mitsubish OP
9h

Sorry I'm not a network expert, but ChatGPT helped analysed the certificate and reported it's "missing full chain" - The chain is "leaf + intermediate only", while it's supposed to be "leaf + intermediate + root".

While I have forward to our network team, is there any way to bypass from app as a temp fix? Thanks!

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iOS 26: "TLS failed with error: -9808"
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