None of the common names in the certificate match the name that was entered

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Hi @Thomas-Clauzel

your main configuration looks ok ( https://check-your-website.server-daten.de/?q=kabelis.fr ):

Domainname Http-Status redirect Sec. G
• http://kabelis.fr/
195.154.118.225 301 https://kabelis.fr/ 0.047 A
• http://www.kabelis.fr/
195.154.118.225 301 https://kabelis.fr/ 0.063 E
• https://www.kabelis.fr/
195.154.118.225 301 https://kabelis.fr/ 2.483 N
Certificate error: RemoteCertificateNameMismatch
• https://kabelis.fr/
195.154.118.225 200 6.263 A

But your certificate

CN=kabelis.fr
	22.01.2019
	22.04.2019
expires in 69 days	kabelis.fr - 1 entry

has only one domain name. So it looks that your www- and your non-www version are using the same vHost (that makes things simpler).

But then your certificate should have both domain names.

So create one certificate with the www- and the non-www version.

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