You want to be able to export that cert and import that into ISE, like you would do for a Wildcard cert. If so, what you would need to do is export the certificate and key from that server as a pkcs12 file (or pfx for windows). This file has to be then split into private and public key using openssl…
OpenSSL How to Disable Ciphers Solutions | Experts Exchange openssl is the tool to access your web server as client (just like a browser does), what openssl reports is the configuration provided by the service listening on the port it connects (most likely 443) and the service listening there is most likely your web server (I guess apache) and not openssl itself Importing Existing Certificates Into a KeyStore Using openssl Jan 31, 2016 Transferring IIS SSL Certificates First, back up your IIS server certificates to a .pfx file using the following OpenSSL command: openssl pkcs12 -export -out DigiCertBackup.pfx -inkey your_private_key_file.txt -in your_domain_name.crt -certfile DigiCertCA.crt This will combine your primary certificate, intermediate (CA) certificate, and your private key file into a .pfx backup Apache: CSR & SSL Installation (OpenSSL)
Various Types of OpenSSL Commands and Keytool
First, back up your IIS server certificates to a .pfx file using the following OpenSSL command: openssl pkcs12 -export -out DigiCertBackup.pfx -inkey your_private_key_file.txt -in your_domain_name.crt -certfile DigiCertCA.crt This will combine your primary certificate, intermediate (CA) certificate, and your private key file into a .pfx backup Apache: CSR & SSL Installation (OpenSSL) For help moving your certificates to additional servers or across server platforms, see our OpenSSL export instructions. If you need to disable SSL version 2 compatibility in order to meet PCI Compliance requirements, add the following directive to your Apache configuration file:
PHP: openssl_pkey_export - Manual
Importing Existing Certificates Into a KeyStore Using openssl Jan 31, 2016