From August 19th 2020, SECTIGO issues SSL certificates with a maximum lifetime of 398 days (13 months) as specified by CA/Browser consortium. SSL certificates with a longer lifetime must be re-issued annually (free of charge). You'll receive reminders via e-mail. SSL certificates issued before August 19th 2020 remain valid until their planned expiry date. Code Signing & S/MIME certificates are not affected and remain valid until their planned expiry date.

How to export an existing SSL certificate from Windows IIS and reuse it on Linux (convert .PFX to .KEY and .CRT)

1) In Windows, right click on the SSL certificate and export to .PFX

2) On Linux, convert the .PFX file into .CRT, ca_bundle and .KEY file.

openssl pkcs12 -in cert.pfx -nocerts -out cert.key
openssl pkcs12 -in cert.pfx -clcerts -nokeys -out cert.crt
openssl pkcs12 -in cert.pfx -nodes -nokeys -passin pass:mypassword -out ca_bundle.pem

See also: https://www.markbrilman.nl/2011/08/howto-convert-a-pfx-to-a-seperate-key-crt-file/

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