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 do i create /.well-known/pki-validation/... ?

For File Based Authentication, please create a folder structure "/.well-known/pki-validation/" under the root directory. Som (S)FTP programs won't be displaying folders beginning with a dot by default, it might be necessary to enable the "show hidden files" setting.

Under Windows/IIS you cannot create folder names including the dot in the name, instead you have to create a virtual directory, see also: https://msdn.microsoft.com/en-US/library/bb763173.aspx.

In Mac OS (OSX) Server the .well-known functionality needs to be enabled inside Apache configuration. For details see https://www.interssl.com/en/knowledgebase.php?action=displayarticle&id=774

Then create the file using following details or download the Authentication file by clicking the "Download Auth File" button and place it in the "/.well-known/pki-validation/" of the HTTP server, like so: http://www.example.com/.well-known/pki-validation/<filename>.txt

It may take some time for file to be automatically validated and cert to be issued by Certificate Authority

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