SSL Implementation: Private key does not match Public key

[Cognos91]

Hi,
We are implementing SSL configuration in Cognos analytics, and are using 3rd party certficates. The request.csr is generated from the analytics server, and the certificates are generated using Digicert. WHen we import the certificates in Cognos, we receive the following error: Private key does not match the public key,
It looks like there is some disconnect between the csr file and certs provided.

Is there a way to determine what is the difference in the key? Based on the IBM KB article, we set the password to NoPassWordSet in the csr file.

Thanks.