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How often should you renew SSL certificate?
When they expire, web browsers will warn their users about your website. The reason SSL certificates expire is to keep your encryption up to date. By requiring you to renew your SSL certificate every two years, you’ll always have the latest TLS versions and ciphers.
Do I need to generate a new CSR to renew my SSL certificate?
To renew an SSL/TLS certificate, you’ll need to generate a new CSR. For more information about creating a CSR, see our Create a CSR (Certificate Signing Request) page. Best practices are to generate a new certificate signing request (CSR) when renewing your SSL/TLS certificate.
Is it possible to regenerate my private key?
So the answer is: no, your private key is lost. If the private key could be recomputed from what you have left, then it would be cause for concern. You will have to generate a new private key, and obtain a new certificate.
Do you need to renew your SSL certificate?
Most applications such as firewalls, load balancers, etc. Some servers, including Apache and NGINX servers, allow you to use the old CSR to renew 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 your SSL cert.
What happens if I Change my SSL key?
Gives you a chance to increase your key size to be ahead of the curve. Doesn’t really give you any concrete protection against key cracking unless you’re using terribly small keys. SSL checking / anti-MitM plugins for browsers might alert the user that the key has changed.
Are there any benefits to changing your private key?
As mentioned in the question you linked, there are benefits and drawbacks. Gives an attacker less time to crack the key. Somewhat of a moot point if you’re using reasonable key sizes anyway. Halts any evil-doers that may have compromised your private key. Unlikely, but unknown. Gives you a chance to increase your key size to be ahead of the curve.