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How to Install a SSL certificate on Plesk

NOTE: This guide assumes you have logged into your Plesk interface - guide here.
NOTE: For the SSL to install, the DNS for the domain must be pointing to the server for verification.


Install Let's Encrypt Free SSL on your domain


Step 1 - Click on Let's Encrypt.
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Step 2 - Press Install (this button could be Renew if you have Let's Encrypt already installed but wish to renew the certificate).
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Install a Custom/Paid SSL on your domain



Generate CSR & Private Key

Step 1 - Click on SSL/TLS Certificates.
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Step 2 - Click on Add SSL/TLS Certificate.
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Step 3 - Input the Certificate name (this is for your reference) and the details for your certificate, then click Request.
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Step 4 - Find the SSL Name that you have just created and click on it.

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Step 5 - You will find the CSR and Private key here that is generated by the server - you will need to use this to generate the SSL Certificate from your SSL provider.



Installing the SSL Certificate and Intermediate Certificate

Step 1 - Once you have the certificate files, go back to SSL/TLS Certificates and click on the SSL instance you have created previously.
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Step 2 - Upload the Certificate (may be a .CER file which is fine) and the CA Certificate (or Intermediary Certificate).
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Step 3 - Go back to the home page of Plesk and click on Hosting Settings.

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Step 4 - Here, ensure that the Certificate selected is the one you created before, you may also want to use the HTTP to HTTPS redirect to utilise the SSL (Please note, this may break your website depending on how it was developed, if it does, disable the redirect) - after, click OK to apply your changes.

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To check if your SSL is installed, you can go to this website and check -> https://www.sslshopper.com/ssl-checker.html.