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Like most things in life, it depends. You will have to generate a new Certificate Signing Request (CSR) if you are using the following server types:
Some servers, including Apache and NGINX servers, allow you to use the old CSR to renew or reissue your SSL certificate and install a new certificate without generating a new CSR; however, security best practices suggest that you should generate a new private key and CSR when renewing or reissuing your SSL certificate.
If you have any of the above server platforms, you must generate a new CSR before you submit your renewal or reissue request.
Please contact our support team if you have any additional problems or questions.