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.

Microsoft IIS: multi-domain SSL on a single IP. Setting up host headers for IIS with SAN

How to configure SSL host headers in Microsoft IIS 7.0
https://knowledge.geotrust.com/support/knowledge-base/index?page=content&id=SO11543&actp=LIST&viewlocale=en_US 

How to configure SSL host headers in Microsoft IIS 7.0 or 7.5
https://knowledge.rapidssl.com/support/ssl-certificate-support/index?page=content&id=SO20113&actp=search&viewlocale=en_US&searchid=1430140675436 

Configure a Host Header for a Web Site (IIS 7)
https://technet.microsoft.com/en-us/library/cc753195%28v=ws.10%29.aspx?f=255&MSPPError=-2147217396



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