Hi everyone,
Let me explain this.
Let's Encrypt was using "DST ROOT CA X3" for certificates and it has been expired on 30 of September 2021. Because of this, since there are not any new CAs in the clients, certificate errors occurred, and Let's Encrypt now uses "ISGR ROOT X1" and "ISRG ROOT X2" as new Root CAs.
To solve the certificate errors, you should import the following certificates (ISGR ROOT X1, ISRG ROOT X2, ) to your computers or other devices.
You may also get a certificate error because the ones in the list below use "DST ROOT CA X3".
Windows >= XP SP3 (assuming Automatic Root Certificate Update isn’t manually disabled)
macOS >= 10.12.1
iOS >= 10 (iOS 9 does not include it)
iPhone 5 and above can upgrade to iOS 10 and can thus trust ISRG Root X1
Android >= 7.1.1 (but Android >= 2.3.6 will work by default due to our special cross-sign)
Mozilla Firefox >= 50.0
Ubuntu >= xenial / 16.04 (with updates applied)
Debian >= jessie / 8 (with updates applied)
Java 8 >= 8u141
Java 7 >= 7u151
NSS >= 3.26
I hope it's clear now.
Regards.
5 Ekim 2021 Salı tarihinde saat 19:54:28 UTC+3 itibarıyla Ben Bowler şunları yazdı: