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iOS 18 has new issue with self signed SSL certificate
After updating my iPad 11 Pro to iOS 18, Apple’s email client now refuses to honor the self signed certificate I use for my IMAP server with the error ‘Unable to create a secure connection to the server ("bad certificate format" -9,808).’ Clients on other platforms such as Android, Windows, Linux and Solaris work fine. iOS 17 email accepted the certificate chain without error. I imported my CA root certificate into the iOS trust store and enabled root certificate trust for it, and still cannot get past this error. The certificates were generated with OpenSSL utilities version 1.1.1w. Anyone have insight into a more detailed meaning for that error code, or a pointer to a tool that will identify what is offensive with my certificate to iOS. This is a high priority for me. Thanks.
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Sep ’24