I recently received an error that my SSL certificate did not match the private key. How can I validate that the cert matches the key?

1 Answer 1


You can validate that a CSR, certificate and privatekey match each other by comparing their Modulus values:

Here is the CSR modulus:

openssl req -noout -modulus -in mydomain.com.csr

Here is the certificate modulus:

openssl x509 -noout -modulus -in mydomain.com.cer

Here is the privatekey modulus:

openssl rsa -noout -modulus -in mydomain.com.key

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