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Sorry I am a beginner about ssl cert.

according to

it will gen a keystore and CSR.

we generate the CSR and send to Certificate Authority.

What if I lost the keystore ? should I regen the CSR again to reapply the ssl cert?

Refer to It will generate a new keystore file.

is it the file store the private key? which stated in , which say

1. Private Key file loss.

2. Private Key pass phrase loss.

3. Private Key file has been compromised due to the server being hacked.   
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Yeah, if you've lost the keystore then you've lost the private key.

The certificate generated from that CSR is now unusable to you, but the certificate authority should happily re-issue a new certificate if you generate a new CSR from a new private key.

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