Question
How to remove an SSL/TLS certificate from Plesk?
Answer
The steps differ for a certificate stored in a domain's repository, and one in the admin's repository (used by the panel on port 8443).
Note: Certificates can only be removed if they're not assigned to a domain, mail server, or any other objects/accounts.
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Log in to Plesk
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Deselect the certificate wherever it's being used
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In Domains > example.com > Hosting & DNS > Hosting, set the certificate to Not selected
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In Domains > example.com > Mail Settings, set the certificates for mail and webmail to Not selected
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In Domains > example.com > SSL/TLS Certificates > Advanced Settings, select the certificate and hit the Remove button
Note: If there are issues, make sure the certificate is not used by any other services in the Used column
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Log in to Plesk
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Deselect the certificate from anywhere it's being used
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In Tools & Settings > IP Addresses, open each IP address and make sure it's not selected, or choose another
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In Tools & Settings > SSL/TLS Certificates, choose another certificate for Plesk and mail, and
Select a different certificate and press Make Default
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Select the certificate and hit the Remove button
Note: If there are issues, make sure the certificate is not used by any other services in the Used column