Renewing SSL Certificate

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It's now a year since I successfully installed SSL on our Centova server. It's now time to renew the certificate and to do this I need to generate a new CSR and then install the new certificate. Last time I followed the instructions in  http://www.centova.com/doc/cast/installation_manual/08_Configuring_SSL - "Installing Your Own Certificate".

Are there any tips or gotchas inherent in generating a new CSR and/or installing a new certificate? Things that might be unwantedly over-written or otherwise problematical, for example? Things to watch out for?

Thanks!
R

Any pointers gratefully received.
Well, it seems we were able to use the existing CSR to get the new certificate. After that it was a matter of concatenating the files in the package in the right order (.crt at the top, followed by the three bundle elements), naming it [whatever].pem and installing it as per the manual. All went well (well, it did eventually, after I spotted a typo in my setssl command).

Hoping this info is useful to someone...
--Richard E