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June 3, 2020

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On May 30th 2020 the certificate of “AddTrust External CA Root” expired. This certificate was 20 years old and had been used by Comodo/Sectigo to sign the certificates they sold. While it had already been replaced a long time ago, it was still being included by Sectigo in the certificate chain, because it added support to old devices (like old Android systems) that didn’t know the new certificate yet.