To install a SSL certificate on your macOS Server, please follow the instraction below:
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Select Certificates in the Server app sidebar.
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Click and choose Show All Certificates.
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Click the Add button , then choose Get a Trusted Certificate from the pop-up menu.
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Click Next, then enter your company or personal information in the fields.
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Click Next, then click Finish.
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Double-click the pending certificate signing request, in the certificates list.
Some certificate authorities ask you to enter the CSR text in a field on a webpage instead of uploading a file. In that case, click Save, then click the triangle next to the Certificate Signing Request. Then you can copy and paste the text to the CSR field when configuring SSL after you have placing your order with Nettway.
NOTE;After you received files from the Certificate Authority (CA), drag them to the Certificate Files section of the Certificate Signing Request pane.
If the CA requires you to upload the CSR file, click Save and save the CSR file, then follow the instructions on the CA’s website. On the CA’s website, look for SSL Certificates.
For more information on installing SSL, please check with CA's website: