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I have an SSL certificate that expires on Februray 15, 2015. What if I install new certificate on my server on Feb 10, 2015. Will my certificate work with new renewed certificate on Feb 10 as my old certificate expires on Feb 15?

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What kind of server is it? A web server? If you install the new certificate, it should work. When a certificate is signed, it is available to use right away. Clients connecting to the server will authenticate the certificate as long as they have the signing authority certificate installed as a trusted CA (i.e. it was signed by a certified signing authority, who you presumably bought the new certificate from).

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The renewed certificate is likely to be a completely new certificate. A certificate is immediately valid from the date it is issued, therefore once the renewed certificate is issued you can immediately replace the old one with the new one.

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