Dear customer,
Please note that Sectigo AddTrust External CA Root certificates have Expired on May 30, 2020.
Refer: https://support.sectigo.com/articles/Knowledge/Sectigo-AddTrust-External-CA-Root-Expiring-May-30-2020
In order to fix the issue, you need to upload the latest CA bundles in your hosting panel. You can use below-given links to download the CA bundle:
USERTrust RSA Certification Authority - https://crt.sh/?id=1199354 USERTrust ECC Certification Authority - https://crt.sh/?id=2841410 COMODO RSA Certification Authority - https://crt.sh/?id=1720081 COMODO ECC Certification Authority - https://crt.sh/?id=2835394
Clicking the 'certificates' label on crt.sh links provides a download to the certificate file itself
You can refer below-given article for FAQ on CA expiry: https://support.sectigo.com/Com_KnowledgeDetailPage?Id=kA03l00000117WR#Q2
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