First get a new clean PFX:
Using the Utility (found here - https://www.digicert.com/util) to rekey/reissue and create a new PFX file:
Next, use this command to convert the PFX into a new JKS (this process automatically assigns a random server alias if you are creating a new Keystore): keytool -importkeystore -srckeystore DigiCertBackup.pfx -srcstoretype pkcs12 -destkeystore your_keystore_name.jks -deststoretype jks
Note: For your_keystore_name.jks, you can enter an existing keystore name to import in to, or enter a new name to have it create a new keystore.
After you have the new JKS, implement in the connector or server configuration file as normal.