Important Changes to Validation Methods for Wildcard Certificates

The Certification Authority Browser Forum (CA/B) has recently passed ballot SC45 related to file-based domain validation, also known as HTTP File Upload at ZeroSSL. 

Starting from the November 22nd, 2021, you will not be able to use HTTP File Upload as a validation method for wildcard certificates. Instead, you need to use CNAME (DNS) or E-mail validation. 

The change was created in response to the concern that File-Based validation is not a strong enough way to demonstrate that someone has control over a domain's entire namespace. 

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