การทำ How can I find the private key for my SSL certificate
https://www.namecheap.com/support/knowledgebase/article.aspx/9834/69/how-can-i-find-the-private-key-for-my-ssl-certificate#plsk
Win+R > mmc.exe > OK > File > Add/Remove Snap-in > Certificates > Add > Computer account > Next > Local computer > Finish > OK
Then navigate to Certificate Enrollment Requests > Certificates (if the certificate request was not completed) or Personal > Certificates (if the certificate request was already completed) folder, right-click on the certificate entry and click All Tasks > Export to open the export wizard. More details on the export process can be found here.
As a result, you will receive a .pfx file containing the key. To get the key in plain text, you can convert the .pfx into PEM encoded files using tool (PKCS#12 to PEM option).
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การแปลง PKCS#12 to PEM option https://decoder.link/converter/
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