Self-Signed Certificates are installed on WHM / cPanel servers by default. These certificates expire just like SSL Certificates from a Signed Certificate Authority. You may have received an email from your server, such as "Certificate for services on hostname will expire in less than 30 days". As long as your SSL Certificates are Self-Signed, this procedure will resolve that email notification.
If you are looking for the free DV certificates cPanel can automatically create for your websites, please see our article on AutoSSL.
Regenerating Self-Signed Certificates in cPanel / WHM
You'll need root access to your WHM Panel to proceed with regenerating self-signed SSL Certificates. Simply follow these steps (or see the video at the bottom of this article):
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Login to your WHM Panel. ( https://yourserversip:2087 or http://yourserversip:2086 )
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Navigate to Home » Service Configuration » Manage Service SSL Certificates
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Once on this page, you should see a list of cPanel's Services that use SSL Certificates. When clicking on 'Certificate Details', you should also notice Issuer: (self-signed).
