Both the key file and the certificate file need to be in PEM.
Note that your private key might be compromised if you sent it over the internet, in particular if also transmitting your password. You should revoke that certificate and have a new CSR signed, converting the output to PEM locally.
Note that your private key might be compromised if you sent it over the internet, in particular if also transmitting your password. You should revoke that certificate and have a new CSR signed, converting the output to PEM locally.