1.The renewal date for a certificate is within 90 days before expiry and 15 days after expiry of the certificate.
2.When generating your CSR for a Wildcard certificate, the character "*" must be used at the beginning of the Common Name, such as *.yourdomain.com.
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It is a little difficult for a layman to install an ssl certificate on his/her website, there is a little technical knowledge is required for that but there are two must requirements prior to install ssl certificate your website.