This certificate expiry doesn’t only affect older versions of macOS. It may be possible to make changes within the root certificates to work around this: details are given in that article.Īlthough this specific problem shouldn’t affect any Mac which has been updated to a version of Mac OS X or macOS later than 10.12.2, all later versions of macOS are prone to a related problem… Although later versions of Mac OS X and macOS have had replacement root certificates installed, those aren’t in older versions of Mac OS X, nor in iOS prior to version 10. This is relied on by Let’s Encrypt security certificates. The reason, explained in full detail by Scott Helme, is that a widely used root security certificate, that for IdenTrust DST Root CA X3, will expire in just over a week, on 30 September. The name has changed, but otherwise it's business as usual for Mac OS Mac OS X OS X macOS.If you’re still running El Capitan, or any version of Mac OS X prior to 10.12.1, then you’re about to run into problems with some popular security certificates. Add in the Mac’s stale, aging hardware lineup and Apple’s total lack of communication about it, and there seem to be real problems for the Mac as a platform.īut for all the Mac users already out there, Sierra happily trundles along in the operating system’s quiet and reliable groove. It has been a long time since the Mac was Apple's favorite child, and there are places in Sierra (like the Messages app) where it clearly feels like Mac users are getting a second-tier experience compared to people on iOS. El Capitan and Sierra both designate one or two big "hero" features for Apple to plan its marketing around (window management in El Capitan, Siri in Sierra), a decent range of medium-sized changes, at least one big under-the-hood addition (System Integrity Protection in 10.11, the Gatekeeper stuff in 10.12, and APFS next year if all goes well), and a smattering of minor improvements to the core apps. Since Yosemite, things have felt more tightly controlled, more planned. Further Reading OS X 10.11 El Capitan: The Ars Technica Review
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