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Windows 7 \| NET::ERR_CERT_AUTHORITY_INVALID Error Posted by on 04 October 2021 04:06 PM
Dear Customers, Starting October 2021, Let's Encrypt has changed the validation of the Let’s Encrypt certificates. Please refer https://letsencrypt.org/docs/certificate-compatibility to know more about this change. Websites are giving the error "NET::ERR_CERT_AUTHORITY_INVALID" while accessed from outdated client operating systems, including the following ones: Windows < XP SP3 Windows 7 (without the specific root certificates update installed). macOS < 10.12.1 iOS < 10 Android < 7.1.1 (but >= 2.3.6 will work if served ISRG Root X1 cross-sign) Ubuntu < 16.04 Debian < 8 Resolution: Option:1 Install the latest Operating System in your computer Option 2: Manually install the “ISRG Root X1” certificate. Steps to install the “ISRG Root X1” certificate: Remove the expired certs manually: `Windows > Run > certmgr.msc` Find: "DST Root CA X3" Remove the 3 expired ones Manually install the new one cert: Download https://letsencrypt.org/certs/isrgrootx1.der Double-click on the file Install Important: choose to "Place all certificates in the following store": "Trusted Root Certification Authorities" Please contact our Support team if you have any questions.

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