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No, a CSR is a unique fingerprint of the server requesting it. If you generate a CSR from a test server, then you can only install the certificate on that server.
You could practice the technique though used to generate the CSR, no harm there. You just won't be able to use that CSR when you perform your upgrade.
I'd already made up my mind that I was just being paranoid to request confirmation on this forum that the SSL certificate requested on computer A could be used on computer B. Please can you clarify:
Why is it then still being suggested for people to use 3rd party sites to do CSR requests like in this FileMaker Community thread? (Admittedly that's for FMCloud)
A wildcard certificate request would be done on one FileMaker server computer for sharing across a number of them, so why can't this apply to a domain certificate being generated on another computer too?
I've used my MacBook Pro to create CSR's for many of the FileMaker Servers that I manage over the years. As long as you have access to the private key file that gets created (you generally need to select this when importing via the Admin Console) it shouldn't matter where you generate the CSR's, at least in my experience.
Thanks for your helpful answer Andrew.